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    Pilot/Book 1 Guesses 
The 'fart car' might be a car designed for methane breathing passengers

The number on Tulip's hand only changes in the presence of train staff
Whatever it represents, it has to be registered by a Steward or other being that runs the train.
  • Jossed.
  • Is it? Considering One One is the conductor? And therefor train staff?
    • Well, if numbers only changed in the presence of train staff, then no passengers would ever be able to disembark from the train, and we see that they do.

The "Infinity Train" that Tulip is on. . .
Is the same one that Finn and Jake were trapped on in the Adventure Time episode "Dungeon Train".
  • It's a bridge of sorts between any and all fictional universes and/or dimensions. If every work of fiction that has ever existed has at least one universe to itself (with some franchises having their own multiverses), there could feasibly be an infinite amount of universes and therefore the train is infinitely long.

Infinity Train takes place in the same universe as Dracula, but in the distant future.
And she's thus a descendant of Abraham Van Helsing — they share a last name and both are Badass Bookworms.
  • Probably Jossed, since Tulip's last name being Van Helsing was an example of Trolling Creator.

It's a tradition in Tulip's family (either side) to have the children named after plants, or at least have nature-related names.
Maybe Tulip's mother's name could be Lily or her dad's name could be Asher Van Helsing.
  • Jossed. Her mother's name is Megan and her dad's is Andy. She was named Tulip because she almost died due to breathing problems as a newborn, but "came back like a perennial flower."

At least one other Cartoon Network character will appear in one of the train cars, assuming Infinity Train gets greenlit.
Even if it's just for The Cameo or a Funny Background Event, it would still be interesting to see. Especially since Atticus is drawn in a very similar style to characters from Adventure Time (plus AT also had the Dungeon Train as mentioned in a WMG above).
  • Jossed.
If greenlit, Tulip 's theories about what's going on will include her being dead and/or in a coma.
Thus ensuring they can't be correct. Unless that's what they WANT us to think.
  • Jossed. Tulip never brings up any such theories.

Tulip is the child of Reggie and Shane from Twelve Forever.
She looks like something of a combination to both of them taking the red hair from Reggie and glasses from Shane. Reggie must have accepted growing up is a part of life and eventually settled down with her best friend to start a family. On that note maybe the train and where it's located is just the equivalent to Party Island that Tulip developed to fit her ideals of a personal land to explore and ended up being bigger than she originally intended.
  • Jossed; her parents' names are Megan and Andy.

The hand number is some countdown to when Tulip can get off
It seems like quite a coincidence that Tulip's number goes from 53 to 49 if it was random so it must be some kind of countdown to something, maybe when she gets off the train or worse how long she has to live.
  • Confirmed. (The "getting off the train" bit, not the "she's dying" bit.)

Once the full series comes out, Tulip will gain a companion that will either serve as her official Love Interest or become part of a Fan-Preferred Couple with her.
Said companion will be voiced by Greg Cipes, for no reason other than the fact that two other Cartoon Network shows (and one Disney show) have done this already.
  • Alternatively, they might be voiced by Caleb McLaughlin, who has said he's doing voiceover work for an upcoming project on Cartoon Network that he isn't allowed to reveal.
  • I don't know; if they really do feel the need to do that, why haven't we seen this guy in promotional material? And if this hypothetical character turns out to exist, why say it has to be a certain actor?
  • Jossed, with Word of God later stating that she currently has no interest in romance in general.

The Steward is one of many beings that maintain the train
Other "employees" include the Engineer, an ambiguously robotic snake-person, the Lookout, a giant Floating Mask with various Animal Eyes that extend out of the holes on stalks, and the ultimate master of them all, the Conductor, a Humanoid Abomination with no eyes who surges with electric power that occasionally causes it to have X-Ray Sparks and reveal a mutilated, twisted skeleton with cracked, black bones.
  • I'm REALLY hoping Owen Dennis reads this page.
  • It's implied that the Steward USED to maintain the train before Amelia hijacked the train and turned it into her enforcer.
  • Confirmed... well, the Steward "being one of many beings that maintain the train" bit. None of that other stuff is a thing. Cool ideas, though.

The train is getting shorter as Tulip progresses.
The train has a beginning and an ending: these have appeared on screen. At the start of the pilot, we only see 2 cars behind the one Tulip is in, yet she speaks of having traveled through more than that. Perhaps the number on her hand is the number of cars remaining in the train (or at least this section - before some major section-dividing car which is also where a season ends, though not necessarily the first season, after which the count resets and possibly changes color). Notice that it dropped from 53 to 49 (perhaps she had not noticed it changing before) at a point where there are four cars (the two behind her at episode start, the puzzle car, and the fart car) that could detach without her knowing.
  • Where do these cars go? Given as the train is traveling through a desolate wasteland, nowhere good, but it is of no matter to Tulip. (Though if the train has been providing power and water to Corginia, the corgis' future might not look so bright.)
  • Given that the corgis have been trying to open the door for "decades" (which is longer than a corgi's lifetime, so: for longer than any resident of Corginia has personally been alive), the train has presumably been around and stable since long before Tulip started her journey. Narratively, the train starting to break down (in terms of both shedding cars, and if there are more malfunctions like the broken water pipe) is likely the cause of or caused by said journey.
  • Jossed. The train is always creating new cars and is never finished. Later seasons reveal that cars can be "quarantined", but whether said train cars are just made permanently inaccessible to regular passengers or eventually jettisoned altogether isn't clear.

Tulip needs neither food nor drink. Alternately, Tulip is good at scavenging.
Although we have only seen 5 cars as of the pilot, only 1 provides any form of food or water, and that is optimized for dogs not humans. Tulip's journey has apparently taken many hours at least, probably days. If the rest of the train is like this, Tulip has no reliable source of supplies. That said, the source of the water in Corginia suggests that life support materials (water, and stuff from which to make food) are being piped along the train; Tulip may just be tapping into this as needed, perhaps between train cars when she has the best access to such infrastructure.
  • Tulip says in the pilot she's been on the train for a week.
  • Comfirmed that she scavenges. A Reddit AMA had the creator state that she's been picking up food and other essentials in various cars. We do see her brushing her teeth in the business chart car, after all. Also, she's been traveling for months.

Ashley Johnson voicing both Tulip and the Steward is Significant Double Casting
There's a connection between them.
  • Jossed.

Tulip ended up on the train because she was running away from home.
Tulip, for whatever reason, was upset about her life situation and ran off, eventually hopping on what she thought was a normal train. Now she's learning to accept change as she searches for a way home.
  • This also explains why she has the backpack.
  • Jossed, the new trailer shows that she was on her way to programming camp, and boarded the train by accident.
  • Confirmed, actually —- she ran away to go to game design camp since her parents couldn't take her.

Tulip having a number is going to be a major plot point.
Word of God has stated that having a number is more important to the story than what said number is and the story is being revamped now that the show's been greenlit, which included her number being raised.
  • Technically confirmed? Getting your number down is a plot point and an important element of the series overall, but the circumstances that led to getting the number in the first place are ultimately more important since that's the reason you get on the train to begin with.

The train will turn out to be a Genius Loci.
And the Steward acts on its behalf.
  • Confirmed. However, the Steward has been turned from its original purpose by a usurper. There are also multiple of them, though we only see one at a time.

The hand number represents the cart the Steward is at the moment
In the pilot, Tulip has had the number for a week and she doesn't mention it changing from 53. The Steward caused the floodings in Corginia, that according to Atticus started a week ago. The number only changes when the Steward leaves the cart, which could hint to Corginia being cart 53 and the number changing because the Steward left to cart 49.
  • Jossed.

The villain will be an Expy of The Mysterious Stranger.
Owen confirmed Infinity Train will have a similar aesthetic to that Mark Twain segment, and the show's jingle itself appears to be based on a jingle in the segment's score. Perhaps the villain — the Conductor or whoever — will be an A God Am I Reality Warper with Blue-and-Orange Morality.
  • Jossed.

Some episodes will feature flashbacks about Tulip's life before ending up on the train.
Through these flashbacks, we may learn about Tulip's life, but also get hints about the reason for Tulip being stuck on the train.

The series will be rated TV-PG
With both Adventure Time and Regular Show having ended, there are currently only three TV series on Cartoon Network aimed at older children and teens: Teen Titans Go (yes, it's rated TV-PG, despite being marketed towards young kids), Total Drama, and Steven Universe. The last new show with a TV-PG rating was Clarence, which was released in 2014. Since then, most of the network's new series have been rated TV-Y7. The pilot of Infinity Train, however, was also rated TV-PG. If the series itself also has such a rating — and there is no reason to assume it will not — then it may have been greenlit to fill the gap left by the ending of Adventure Time.
  • Confirmed, though the original short was rated TV-G, not TV-PG.

The series premiere will be delayed into 2020.
Delays happen, after all.
  • Thankfully Jossed, it premieres August 5th, 2019.

The last car before the engine will end up being a burp car.
It was going to be said eventually.
  • Probably Jossed. We wouldn't know, since Tulip used the train's ability to rearrange it's cars to skip over a huge chunk of the train and go straight to the engine. We could still theorize that she parked it on top of the burp car.

There will be a literary theme with character names, which will prove to be important later.
If Tulip's last name being Van Helsing turns out to be canon, that's a reference to Dracula. Atticus could be a reference to Atticus Finch from To Kill a Mockingbird. Maybe the major living characters that Tulip meets will all be named after some character in literature, and the entire Infinity Train is a projection of Tulip's thoughts and books she's read.
  • See also Mark Twain's The Mysterious Stranger above.
  • Or perhaps named after characters from both books and video games, given Tulip makes games in the series proper—the life-draining cockroach-dogs are called Ghoms.
  • Jossed.

At one point, the Infinity Train will intersect with another version of itself - the one from the pilot.
Tulip will meet her counterpart from the pilot, with her fancier hand-display design and lower number.
  • Jossed.

One-One has powers he doesn't know about, and that the Steward is afraid of
The Steward left when she saw One-One leave Tulip's backpack, as though she was afraid of him. However, One-One seems like he would want to help Tulip, but was unaware that he can scare the Steward away. Something will happen near the end of the series that makes Tulip aware of One-One's power.
  • Maybe One-One is the key to getting off the train, and the Steward plans to stop Tulip from reaching the final door and/or find something else that she needs to leave the train.
  • Confirmed: One-One is the real Conductor; the Steward is working for the "Conductor" who usurped him.

Tulip was chosen to be on the infinity train for some reason
  • It has been mentioned that someone having a number is more important than the number itself, suggesting that those with a number (such as Tulip) have an important role to play. Also, the train said that it was going to Osh Kosh, where Tulip was heading, but she wasn't at a train station. The train (or someone running it) had to know that Tulip would be there, and that she was heading to Osh Kosh.
    • Confirmed: it chose her because she has emotional issues that she needs to work through, like all passengers.

Tulip is One-One's "mum".
  • At some point she'll build and program a blank copy of him and send him back in time to the snow car, thus creating a Stable Time Loop.
  • Jossed.

The "Snowman" car is Tulip's designated seat.
In the pilot, the Stewart ordered Tulip to return to her seat. Since Tulip woke up in a snowy area after entering the train, that would be her "seat".
  • Jossed.
    • How is this jossed? Did Owen ever confirm it, or?
      • OK, then, implicitly jossed: the train's nature as an Epiphanic Prison is heavily implied to require passengers to travel between cars so they can have the experiences necessary to help them reduce their number so they can go home.
      • I still don't see how that makes it jossed, or implicitly jossed. The "seat" could still just be Tulip's starting point/spawn point. It wouldn't make sense for the Steward to order Tulip to return to her seat otherwise. Also, it appears that not every passenger has a number (otherwise One-One and Atticus would have one). So why don't they have numbers if the train truly required all passengers to have them?
      • Well, it's indicated that all of the passengers with numbers, including Tulip, are supposed to traverse cars like that. And keep in mind that the Steward works for the Conductor, who has a vested interest in preventing Tulip from travelling because she's with One-One, the one Amelia usurped, thus potentially allowing One-One to regain control of the Train.
      • Just because the passengers have seats doesn't mean they can't traverse through the train, like normal passengers irl. But I think I see what you mean. So the Conductor made the Steward forget that the passengers were supposed to traverse through the train, and the only people with seats are those that live on the train, like the flower people and Atticus? Also somewhat related, but I think that the Steward ordering Tulip wasn't out of anything evil, but she ordered her to return because the car she used to be in was "unstable" because of the orbs she removed.

The people that are being "beamed" end up getting sacrificed to the train's version of hell so that it can power the train.
  • Jossed; they're being sent home.

Tulip was sent to the Infinity Train to help open doors.
There seems to be a Running Gag about no one but Tulip being able to open doors for obvious reasons. Perhaps the person who got beamed was sent to help open a specific door but never reached it, or they simply outlived their usefulness.
  • Jossed.

Tulip is a transgender girl
CN has already dipped its toe into LGBTQ+ representation with Steven Universe, so it's not impossible they're featuring a human trans character. Tulip is an unusual name (as she lampshades herself in the first episode, while cheerfully insisting it isn't; rather than resenting it, as you'd expect if her parents picked it out), which could be explained if she chose it herself. She's into game design and coding (both associated with younger Millennial and Gen Z transfeminine folk, with programming also considered a very trans friendly occupation). Her parents are divorced for some undisclosed reason, and her dad calls her "Bud" (which isn't necessarily something you wouldn't call your daughter, but is more masculine coded). Despite being a clear tomboy, in the way she dresses, she still wears a skirt.
  • Jossed: Tulip reveals her parents picked her name due to having a health issue she got over, and we see flashbacks to her as an infant.
    • Not quite jossed (young children look androgynous; and she didn't specifically say Tulip was the name given to her; 1-1 even notes that she could have been named after any perineal flower). Of course, the fact that it didn't come up probably means it's not the case (canonically, anyway), since it's usually assumed people are cisgender by default.

The show is not a miniseries.
Instead, the five-night event is just a special premiere thing ala a Stevenbomb.
  • Seems to be confirmed: Episode 10 ends with text saying "Infinity Train will return".
  • Completely jossed: There's a Book 2, and a Reddit Am A revealed both books were part of the same season order.
    • Technically confirmed, depending on how you define seasons of an anthology show.

One One's Mother is The Steward.
  • Jossed.

The Infinity Train is SEELEs backup plan.
Instrumentality ultimately proved an unmitigated failure thanks to Shinji rejecting it and thus allowing others to return. When the series begins, mankind is still slowly returning from Instrumentality and rebuilding civilization.

But Kihl Lorenz had a backup plan: the Infinity Train. Created by the fusion of parts of every Angel, the train is meant to lure unsuspecting passengers in, and eventually put them back in Instrumentality. That guy we saw get vaporized by that beam of light? That was an Instrumentality escapee being put back in against his will.

This was his backup plan because it's incredibly low-profile, and he knew that if the original plan failed, the surviving members of NERV would have nothing to lose and come after him and the surviving members of SEELE. And he's right, as he's been kept on the run by Shinji and Asuka, both obsessed with finding and slowly disemboweling him for being the ultimate reason they're so mentally and emotionally fucked-up.

Infinity Train will end with Tulip getting off the train...
Either at Oshkosh where she wanted to go, revealing the train did bring her to her destination, or she'll be get off where she got on, at which point she'll run back home and hug her mother while tearfully apologizing for how she acted.
  • Jossed: She gets sent back home, and is able to go to programming camp several months later instead, but this is only the end of the first season, not the end of Infinity Train.
    • Not entirely jossed. The train dropped her off at home, and it's completely possible that she had a good cry with her mom once she got inside. Thanks to the Time Skip epilogue, we don't know.

The Conductor is not the creator of the Infinity Train, but a usurper who stole it from the real creator
She's either an outside entity who took over the Infinity Train for her own purposes or a machine designed to act as a "curator" who Turned Against Their Masters and decided to run the Infinity Train her way.
  • Confirmed, One-One is the real conductor while the usurper is from outside the train. Though whether One-One is more likely a being created to maintain the train for its actual creators.

One-One is a central piece of the train control system, aka "Mother"
One-One obviously has some high value for Steward and Conductor (who is rather clearly worried about the Train operations). He has generally the same shape & size as usual control spheres, that operated the Train equipment. In Corginia, we saw that Steward cannibalized the spheres from non-essential equipment, and later One-One feels responsible for the unfinished turtle kingdom car.

My IMHO, is that One-One is the part of Train control system (maybe the Mother(board)?), and without him in place, the Train gradually start to fell apart, forcing the Conductor and Steward to resort to drastic measures.

  • Confirmed, except that One-One IS the real Conductor.

Tulip's "choice" in the final episode...
...Will be to either stay on the Infinity Train and leave behind her friends and family in Wisconsin, or to go home to her world and leave behind all her new friends.
  • Sorta confirmed. There wasn't any real conflict over it, but she stuck around after being able to go home in order to cure Atticus, and was really sad about leaving her friends behind at the very end.

Whoever made the Train also made the Endless
They're basically opposites: the former is an intrusive therapy instrument that aims for you to be more mature, while the latter is a recreation environment that drives you to insanity. Whereas the Train is on a grim and dark setting, the Endless is on a bright one. Whoever designed these places has no sense of moderation.

Tulip is on the autistic spectrum
Aside from the obvious "has trouble dealing with people and likes books/programming" and Straw Vulcan tendencies, she has an odd taste in food (onionsnote ), says very dramatic things with an even tone of voice and implicitly reads that one programming textbook a lot (reading the same book over and over is one of the more commonly cited more subtle symptoms of ASD in girls and women). She also flinches when the conductor's mecha is smashed; seeing a person isn't scary enough to make you flinch, but unexpected eye contact when you're on the spectrum certainly is.

There's a time difference between the "Train World" and the "Real World"
Similar to shows like Digimon Adventure, and the Hyperbolic Time Chamber, in Dragonball Z. One year in the train, could equal to, say, a day back on Earth. This would explain why her parents weren't worried when she returned. Other than the seven month gap at the end, there was no indicator any time actually passed.
  • Jossed. By Word of God, there isn't, and the show itself demonstrates this repeatedly. The only reason we don't see Tulip's worried parents is because the show deliberately skips over it.

The train specifically picks up people whose emotional troubles are about to get them killed
Tulip was picked up when she'd ran into the wilderness in the middle of winter, with no real plan on how to get to where she was going, and was clearly at risk of dying of exposure (and too angry to realise that). Amelia was at the top of a tall building in a way that makes it clear what she was planning. Essentially the train picks them up at what would be their TOD (if they were going to die anyway, it's not as if them just disappearing makes a difference) and returns them home when (or if) they've been able to process their issues.
  • Jossed in Book 2. Near-death isn't a necessary factor in the equation, as Jesse wasn't in danger of dying.

New passengers arrive in the first car after the engine
In the Snowy car Tulip wakes up in you can see the Conductor flying around and that's where One-One is.
  • Except why would the Conductor put the real Conductor on a car close to the engine, which would increase the odds of One-One regaining control of the train?
    • It's established the conductor can move cars to other parts of the train, they most likely threw One-One in there and sent it to the back of the pile.
  • Even further Jossed in Book Two. The passengers are dropped off by pod things, and one of them was clearly seen flying in the opposite direction from where the train was going.

Vampires lack reflections because they were filed.
As soon as the prime version undergoes vampirism, Mirror World society deems them too dangerous to have a counterpart there.

Every being on the train used to be a Ghom.
The gun the Conductor used on Atticus didn't have an orb in it. The gun, when it doesn't have an orb in it, turns beings on the trains back into Ghoms, or rather, back into their original state.

Alrick died in a plane crash.
One of Amelia's memories visible in "The Past Car" features Amelia and Alrick posing by a plane. Considering this show's penchant for foreshadowing, it would not be a surprise.
  • Jossed? Maybe? Word of God says that Alrick died in a motocross accident, but this statement has a 50/50 chance of being Trolling Creator.

    Book 2 Guesses 
Infinity Train will be an anthology series
Tulip's story's done, so the next season will feature a new protagonist dealing with their own set of problems on the train (feel free to add more).
  • Issues the new protagonist could face include;
    • Death of a loved one (like Amelia, but healthier).
    • Dealing with their sexuality.
    • Moving to a new town.
    • Getting over the guilt of a bad mistake. (This one is Confirmed!)

Neither One-One nor Atticus would play prominent roles... but The Cat may
After all, it's hard to imagine that One-One, now in control of the Train again, would be able to go on lengthy adventures with passengers (and, with him around, basically any problem would be too simple to solve). And while Atticus is awesome, too much talking corgies could be a bit too much. The Cat, on the other hand, has great potential as a character.
  • Part-Confirmed/Part-Jossed: The Cat plays a prominent role in one episode, as does One-One in another. Atticus, meanwhile, only gets mentioned and, at one point, pictured.

Reflection Tulip will be the protagonist of the next series
This way they can keep the same voice actor without having to contrive a reason to get Tulip back on the train.
  • Alternatively, Reflection Tulip would be part of a new protagonist's entourage.
  • Confirmed as of the Season 2 trailer, which mainly shows her on the run from the enforcers and helping a guy who seems to be familiar with Tulip in some way. (In context, he doesn't know the original Tulip. She was alluding to a previous time she mentioned her in conversation.)

Cars only seen briefly or mentioned will have starring appearances.
After all, stuff like the Monster Mash car and the Straight-up Italy car sound interesting.
  • Jossed. All starring cars are new ones.

The season will start In Medias Res, with our new protagonist already having been aboard for a bit.
Then, we'll only get to find out the reason they were taken onboard via either them spilling the beans or someone viewing their memory tape.
  • Confirmed. We and M.T. meet Jesse when he's already been on the train for some time, and then we learn why he's there over the next couple of episodes.

The Steward will have a role as One-One's representative
It will appear sometimes to give the protagonist(s) some advice or instructions from One-One. After all, it is, well, the Steward.
  • Downplayed. It only appears in the last episodes, revealing one of its functions to be acting as a Mech Suit for One-One.

Tulip will still be the protagonist.
Instead of having to reach zero, she'll be called there by One-One to help Mirror Tulip/Gambit, Amelia, Atticus or the train itself.
  • It will be Amelia who figures out how to call her back. One-One believes anyone who leaves the train after completing their journey is "gone forever," because their departure removes their file from the train system. However, Amelia figures out how to hack into an otherwise inaccessible archive in the train's hard drive and pull Tulip's file back up, thereby allowing One-One to unlock her door again.
  • Jossed: Mirror Tulip is one of the main characters, although Tulip does get mentioned.

Kate Mulgrowl the Cat will be revealed to have been human at one point.
While there are several talking animals present on the train, she's the only one we've seen wearing some sort of clothing. Perhaps Mulgrowl was one of the passengers picked up by the train, or was even one of the original train staff. If so, her transformation could have been involuntary or not, but got so used to her life as a cat (and likely the only cat on the train given her Spell My Name with a "The" moment), and/or had some trauma in her old life that she connected with her human name, that she stopped going by her old name by the time Tulip got on the train.
  • The Conductor had a gun that could turn whatever it fired at into whatever an orb inserted into it has data on. If she was a human turned into a cat, we already have a possible cause from canon source.
  • Mostly likely jossed, as Book 3 has her casually reveal she's lived on the train for at least a few centuries. Granted, we don't know how a hypothetical transformation would affect lifespan.

At some point, Atticus will team up with another train passenger, who is a boy slightly older than Tulip.
And they will also be accompanied by a monkey and a pheasant from two other train cars.
  • Sounds positively peachy.
  • Boy slightly older than Tulip as the new passenger protagonist? Confirmed. Atticus even interacting with him at all? Jossed.

The Conductor’s role is to facilitate faster egress through the placement of cars.
Now that One-One is back as Conductor, and the Conductor is apparently in charge of making new cars and slotting them into place, the randomness of the cars and Tulip’s stuttering progress through them in Season One makes a lot more sense. A properly functioning Infinity Train would likely place cars made specifically to help a person deal with their issues into that person’s path.

In either Season 2 or a future season, we will find out who created the train...
...and they will be an inverse of the Mysterious Stranger (aka Satan), since the Stranger in that short said that "people are of no value" which seems the antithesis of the Train's desire to help people. Alternatively, the original creator of the train created it as a form of Blue-and-Orange Morality punishment (much like the Mysterious Stranger), but they were later usurped (by an engineer, One-One, etc.) with the train being reworked to run by its current purpose.

The Infinity Train is not in an alternate dimension. It's in a Bad Future.
The person or persons who created the train designed it to look for people who could potentially change the world for the better in order to prevent the bad future, and the Train selects individuals suffering emotional trauma, helps them grow, and then sets them back in the world with the idea that the changes to their lives will allow them to improve the world. Tulip, as a programmer, could be someone who could influence the world with programs to benefit people. Or, she could have been uniquely chosen by the train to stop Amelia, because Amelia was subverting the train's functions.

We will eventually see new extremes of the numbers.
The good extreme: someone who chooses to stay behind on the train even after hitting zero; their number starts going into the negatives. The bad extreme: someone covered entirely in nines.
  • This would raise the question of what a negative score would entail. Assuming the number tracked a person's unresolved baggage. Improved ability to deal with hardships, perhaps?
  • Given Season 1's fondness for Exact Words, expect an all-nines villain to be referred to before their reveal as being 'dressed to the nines'. Bonus points for the last one, two or even three words being cut off.
    • Confirmed, but we only see one of these extremes in Book 2: the "good extreme", with Jesse returning to the train, and since his problem is actually unsolvable (specifically, he wants to get MT off the train despite her being a resident), his number shifts between various non-natural numbers. The other is seen at the end of Book 3.

Amelie will die between seasons one and two, and the next protagonist will find a memorial to her.
It will be a statue of her, her eyes closed as he raises her numbered hand, revealing it now reads ∞ or, more respectfully, something that indicates she no longer has a number at all: N/A, or, as a nod the programmer Tulip, NaN.
  • If the 'number' is NaN, at least one character in the same car who doesn't know her backstory will refer to her as 'Nan'.
    • Jossed. She's still alive and kicking as of the end of Book 3.

The two halves of One-One each have a Number inside them; since their only baggage is their programmed goal, that number is, naturally, 1.
Their goal is to prevent the apocalypse (see WMG: The Infinity Train is not in an alternate dimension. It's in a Bad Future). Eventually, they will be convinced that all things must end, and they will choose to end the Infinity Train's mission - since their programmed mission is thus impossible, they will both seem to zero out - but two zeros next to each other form just the opposite. The front and end of the train will finally meet, the engine being destroyed in the process, the remaining cars circling forever. One-One's final act will be to emblazon the train with their number, infinity. The ruined world, in time, comes back to life. A forest grows around the train. One day, it is found.

Tulip will not return in Season 2 until the season finale.
The show will follow another character who ended up on the train and One-One, and possibly Atticus and Amelia as they try to investigate the causes of damage and strange deer-shaped hole, with the latter characters recalling what Tulip was like, making it appear as though she will remain a legacy character. Until a finale twist reveals Tulip, somehow having returned to warn of a coming crisis or possibly to seek help.
  • The Season 2 trailer has mirror Tulip mentioning her, implying the newcomer is familiar with her in some way...
  • Jossed on all accounts. Characters do briefly mention Tulip, but this ends up being the last season she's even alluded to.

What the new main character will be like
Jesse has already been set up as a Contrasting Sequel Main Character to Tulip (animal companion instead of a robot one, from Arizona instead of Minnesota), so that means he'll probably be the opposite of her in terms of methodology and personality, i.e., a firm believer of Don't Think, Feel who goes with his gut on everything and doesn't think things through or sweat the small stuff. While this will lead to him taking several aspects of the train in stride, it'll also cause problems in cars that require more thinking like the puzzle-based ones.
  • Partially confirmed. He is far more easy-going than Tulip, but he doesn't have a hard stance on logic vs. emotions. Instead, he's an Extreme Doormat in contrast to Tulip's Control Freak.

What brought Jesse to the train
Jesse is the protagonist for Book 2. Let's use this section to speculate what brings him to the Infinity Train in the first place:
  • Unlike Tulip's family, his parents are still together, but are extremely overbearing towards him, and he got onto the train to escape them.
  • Let's face it, unlike Tulip Jesse has a little brother. He's probably dying in a hospital, if not dead already.
    • Mostly jossed. As quickly demonstrated in the first few episodes, Jesse is actually on the train because he's an Extreme Doormat who needs to learn to assert himself and not just bow to peer pressure. His family is technically involved however, as "The Toad Car" reveals that the breaking point that made Jesse guilty enough for the train to pick him up was when he let his obnoxious friends bully his little brother Nate and break his arm.

Jesse will be the one to nickname The Cat Kate Mulgrowl.
  • The Fan Nickname for the cat was adopted officially in a Reddit AMA. Given Jesse has already established himself as The Nicknamer, given he names Allen Dracula, he may also be the one to come up with Mulgrowl's name on-screen.
    • Jossed. He doesn't meet her again to get the chance to nickname her before he exits the train. Twice.

The Mirror Cops' suits ripping will be a Chekhov's Gun
  • One of them mentioned that he'd be a goner if their suits were ripped enough, so it has to be leading up to something. Either MT would do it intentionally, Jesse would do it accidentally, or that their suits would just catch on something else so we wouldn't have to watch our child protagonists kill anyone
    • Jossed, but they still die, with one of them dying by MT's hand.

The Mirror Cops' are also considered passengers
  • Seems that chase after MT is making them (or at least Sieve) more... human-like. Less narrow-minded on his goal, but more on his interactions with Mace, his appearance, ect. Could it be, that One-One decided, that Mirror Cops also needed some lessons?
  • Jossed; they're all denizens. One-One is very clear about that.

Another licensed song will be used
  • Like Cameo's Word Up, another song will play during an episode and establish this as a Once a Season gag.
    • Jossed.

Agents Mace and Sieve will eventually call in a superior of some kind, who will act as the Big Bad for the rest of the season
The two don’t really seem to be main villain material. It’s possible that they share The Steward’s role of being the muscle of a more cunning, mysterious threat.
  • Jossed.

Alan Dracula is more aware than he seems
He acts mostly like a regular, if superpowered deer, but what if he’s more? One-One seemed like just a weird little robot at first. And even by the train’s standards a deer with shapeshifting powers and laser eyes seems pretty weird, especially since the actual focus of that car was the family tree.

Alan Dracula causes problems for the train, or at least is seen as doing so
  • The Parasite Car could've been a double meaning title. If it's revealed, MT would stand up for him, arguing that he should live free like her.
    • Jossed. One-One even calls Alan Dracula his best work.

MT will succeed in liberating the reflections at the end, and Jesse's reflection will appear
  • The description of the last episode sounds like it and MT can't run away forever. It'd also give her something to do at the end and it'd feel weird knowing that reflections are still suffering. if that happens, Jesse's would appear and give him flack for kissing mirrors.
    • Jossed.

Grace, for whatever reason, wants to raise passengers' numbers, including Jesse's
  • You've heard her reaction to seeing his number, and leading the destruction of the carnival. Jesse would go back to his old ways with a new Toxic Friend Influence, but will bounce back and get to zero.
  • Confirmed!

Amelia will eventually get her number to zero but want to stay to help other passengers.
  • Amelia will have been helping passengers figure out their issues and leave, including members of the Apex to atone for having inadvertently inspired them in the first place, and it will lead to her number going all the way down. But Amelia just feels happy enough staying to continue helping others, and she feels she's been gone far too long to just go back home now. The paradoxical conflict of not wanting to leave, despite her full recovery from her initial problems, will cause the train to turn her number to an infinity symbol, which will trap her aboard indefinitely but ultimately solve her desire to stay anyway.

There is no "wasteland world" outside the Train.
  • The Train is a pocket universe of its own. The desert outside existed only for one reason - to provide some non-lethal medium, in case some passenger would accidentally or deliberately leave the train, habitable (so they wouldn't die immediately) but uninteresting and hostile (so they would not try to stay here for long). The whole wasteland only a relatively small (probably no more than a few kilometers wide) stretch of the desert outside the train - outside of which is literally nothing, time & space of the Train universe ends here.
    • Seemingly confirmed by One-One's train documentary of the Tape Car, which claims said car is the only one where the universe is projected on the outside, implying that the wasteland is the Tape Car's projection.

The black market dealer that was selling tapes will get a hold of Jesse's "sequel" tape.
  • And then market it with his first tape as a two-for-one deal. (probably just charging the price of two tapes anyway)
    • Jossed.

Grace will eventually become the first passenger to get kicked off the train.
If she and her gang keep doing what they've been doing, it'll only be a matter of time before One-One gets fed up with them, declare them beyond the train's help, and unceremoniously send them back to wherever they came from.
  • Or, perhaps banish them to the Wasteland. They'll probably deserve it by that point.
  • Considering the "blue and orange" morality of the One-One (and his experience with Amelia takeover), he would probably just remove Grace (by trapping her in exit-less car for the rest of her life), or simply shot her dead if she starts to be a real danger to other passengers.
  • Jossed. She gets better before it can possibly get to that.

The Tape Car has a "public room" of sorts that passengers may walk in and out of.
Given the Tape Car seems to be somewhere roughly in the middle of the train, if the whole thing were inaccessible to the public, then it'd be a major obstacle for passengers traveling to and from the cars in front of and behind it. So, there's probably one area that can be freely walked in and out of through the typical train doors, with a hidden hatch somewhere to the car's inner workings that only the robotic staff can access (or someone who can hack the train, like Amelia and Tulip did). As for what's in the public room of the car, possibly something similar to the "Bliss Car" that Tulip was supposed to start out in early in production; it does seem to feature a concept similar to the tapes featured in the show itself, and the Tape Car is (obviously) where the tapes are made.

    Book 3 Guesses 

The old man who Lake stole a pod from
Will be the main character of Book 3, perhaps he'll be suffering from Dementia or loss of love ones. Maybe he's trying to avoid the fact he's getting older and so that's how he ended up on the train.
  • Or he could have trouble getting over his late wife, bond with Amelia over similar experiences, and eventually try hooking up. Bonus points if arguments about the whole Replacement Goldfish implications (especially if Amelia feels the old man's actions hit a little too close to home) causes their numbers to rise.
  • Even more bonus points if, thanks to Lake's pod-stealing business, his journey becomes much, much more difficult than any other passenger's.
  • Original Theory OP here, just wanted to add a bit more on: A older protagonist could make for an interesting contrast to other protagonists. Since so far all main passengers have been on the younger side. An old man could provide a new perspective on things, especially given his rather traumatic introduction to the train with him getting pod jacked. He could also face different challenges due to his old age, not being as active or energetic as previous protagonists.
    • Jossed. The protagonists are the Apex members Simon and Grace.

The Apex will be the main book antagonists.
Much like how the Mirror Police were set up as antagonists of a single episode of the first book and then fleshed out in their role for the second, the Apex—antagonists of "The Mall Car" in Book 2—will play a greater role in Book 3. Their appearances in Book 2 left the issue of their toxic Cult of Personality mindset and influence unresolved, which was done so that the main passenger of the next book can clash with them and ultimately bring about a resolution to that dangling plot thread.
  • Jossed. It's just Simon.

The protagonist of this season will have much, much more serious problems than Tulip or Jesse
They'd probably be an adult.
  • Perhaps a soldier who has PTSD and doesn't see humanity as worth it anymore?
    • Remember that the show creators still have to cater primarily (at least on the surface) to kids and teens, so we probably aren't going to see an adult as the protagonist, nor will they have something quite so severe. However, given that Infinity Train has shown the ability to include certain things typically seen as unsafe for children, we still might get something fairly racy. Severe bullying, dead relatives or friends, debilitating injury, and other stuff on that level are well within the realm of possibility.
    • Confirmed. The protagonists are Grace and Simon, with child neglect and murder appearing as themes.

The third season will see a major overhaul in how OneOne operates the train.
The first season showed that a determined passenger could take over the train(but now how!), and the second season showed that things could go very wrong with the therapeutic process the train is attempting, with both the Apex and Jessie gaining train-worthy trauma FROM the train. At this point I think we've seen all the normal operations of the train as well(except perhaps the caboose?), but they've now proven themselves to be insufficient. Therefor, season 3 will show OneOne or some outside influence making changes to address these problems, perhaps causing their own problems in turn(such as trying to kill all the Apex, all the passengers or something equally drastic).
  • Jossed. One-One doesn't even get involved directly in the plot, though his influence is felt through discussions of him.

Amelia will be the main character.
Just as season two follows Mirror Tulip/Lake, season three may do the same with Amelia, as she wanders the train trying to redeem herself. She will confront the Apex and try to make them change their ways, which will form the main conflict.
  • Jossed. She does appear at the end of Episode 6 and stays in the plot until the start of Episode 9, though.

The Ghom are corrupted passengers.
If a passenger's number goes too high, they will turn into a Ghom and be banished to the Wasteland. This will likely happen with Grace or Simon, perhaps both, and there might be an attempt to reverse the transformation. Amelia turning Atticus into one with her pod gun back in season one might be foreshadowing for this.
  • That raises the question of how Amelia was able to retain her humanity. Of course, her time supplanting One-One could have played a part in preventing a transformation.

The protagonist will be a (former) member of Apex.
They'll have come to the train as a young child and fallen in with Grace's gang/cult/thing for years, but will have a Heel–Face Turn and try to escape the train for real, or at least try to atone.
  • Partially confirmed. Grace and Simon are the protagonists, being the leaders of the Apex themselves. And the season ends with the former disbanding the group, fulfilling the "former member" idea.

Hazel has no number because she was born on the Infinity Train.
Word of God said she doesn't have a glow, so I'm guessing Hazel doesn't have a number and is probably the answer to the question of what happens if a child is born on the train and their parents manage to get their number down and leave. As an extension of that, the premise of the season has Grace and Simon's ideologies be challenged, so they'll probably spend much of the season assuming that Hazel is a construct of the train and treat her as such, before some event happens that makes them realize she's just as human as they are.
  • The "no number" part of this WMG has been Jossed. Come the Book 3 trailer, and Hazel does indeed have a number; it just doesn’t glow.
  • Sort of. She's a construct of the train inadvertently created by Amelia, and the group spends the season assuming that she's human rather than a denizen.

Hazel has a negative number. (We don't see it on the poster because numbers go on the palm, and only the back of her hand is visible.)
She's not there because of any internal conflict of her own, but because the train thought she was exactly the person that Grace and Simon needed to meet in order to fix their number problems.
  • That tweet by Owen Dennis that most people seem to assume confirms a lack of number, actually only says that her hand isn't supposed to be glowing. Maybe negative numbers actually absorb light instead of emit it, making them look like vantablack. Or alternatively, they might go on the opposite of the right hand, the left foot. What if they made her barefoot so that her number would be visible?
    • Jossed. Hazel’s number is 337, but it isn’t glowing for an important reason. She's a failed clone based on Alrick and Amelia herself, with the 337 being Amelia's starting number.

Book 3 will be Darker and Edgier.
We saw it happen with Samurai Jack when it moved to Adult Stream. This show is also no longer on Cartoon Network, so it may have more free reign with what it can do.
  • Maybe, but not by much. Samurai Jack changed the way it did when it moved to Adult Swim because of its audience having grown up twelve years since it last aired on Cartoon Network, but the wait between Seasons 2 and 3 of Infinity Train is only seven months. And Owen Dennis doesn't seem like he'd make the show darker than it needed to be just because he theoretically "could" with it being on HBO Max. Even if the show overall is darker than most of Cartoon Network Studios' other shows, this troper really doesn't think it will be much darker than the previous two seasons.
  • Zigzagged. The season does deal with heavier issues, but the lengthy production time of animation means the move to HBO Max has nothing to do with it.
  • Considering the fact that Simon kills Tuba in Episode 5 and Simon refuses to redeem himself and suffers a graphic Karmic Death in the finale, it's pretty much confirmed.

Hazel is not a real human, but a construct of the train.
Grace considers the destruction of constructs and the raising of her number as honorable, but appears to have a soft spot for children, so Hazel may have been created specifically to appeal to her better nature.
  • Ultimately Zigzagged; she's indeed not a real person, but was created by Amelia as an experiment to recreate Alrick, not by the train as with the purpose of helping passengers.

The original Tulip will return in some way
Either something happened to her that causes her to return to the train, she appears in someone else’s tape or she appears outside the train.
  • Jossed. She isn't even so much as referenced as a factor when Amelia explains why she's working to redeem herself.

Hazel is Grace and Simon's daughter from the future.
Hazel shares some physical similarities with Grace and Simon (particularly the dark skin and blonde hair). Season 3 hints that Grace and Simon will become protective of Hazel, much like parents would, and there appear to be some hints of a romantic relationship between Grace and Simon (the ballroom dancing scene certainly helped fuel this). Might also explain why Hazel's number does not glow, if she was in fact born on the train.
  • Perhaps she originally came from a time travel-themed car (because let's face it, that would be the least weird car that we've seen so far).
  • Assuming this is true, another reason Hazel has a number that doesn't glow might be that it's the next sequence of numbers in Grace's line. We've seen that Amelia's number stretches all about her neck. It's not too much of a stretch to assume that eventually there'd be no room left and like any other trait it was just passed from parent to child.
  • Jossed. Hazel was a side affect of Amelia's numerous attempts to recreate Alrick, so if anything she's basically the hypothetical child of her and her husband if he had never died... that's also part-turtle.

Grace and Simon will still be on the train by the end of the season.
Their mission to figure out why Hazel's number isn't glowing will eventually cause both of them to Take A Level In Kindness and start to better themselves. Most likely, the realization that their growing fondness for Hazel and self-improvement will cause their numbers to go down and subsequently throw them into an internal conflict that will be a major element throughout the show. Even if they both become much better people by the end of the season, both of their numbers are massive and most likely will take years to work off. Book three will end with Hazel being able to get home (assuming she isn't a denizen with a fake number made specifically for them) while Grace and Simon continue to burn off their numbers and serve as much more benevolent guardians to children on the train.
  • Partially confirmed. Grace stays on the train having learned to stop running away from her pain and fears, realizing that denizens are sentient people, and being a benevolent guardian for the children as everyone in the former Apex works to decrease their numbers. Simon, however, refuses to change for the better and in fact gets worse to the point of ordering Grace's death, and even trying to kill her right after she saved him. He gets a Karmic Death by having his lifeforce sucked out of his body and reduced to ashes, all while completely covered in numbers.

The reason why Grace is on the train is that she was felt like she had no life purpose.
For all her flaws, Grace is a pretty altruistic person and is likely the main reason why many children on the train are getting food and some semblance of safety. However, having enough empathy to want to make sure children don't die feels like more than a step behind forming a cult around a vague figure that you know next to nothing about. What if Grace was brought to the train because she felt like her life was empty? Maybe she was in a situation where she felt like she was in a dead-end or she felt powerless. People who feel like they're lacking direction are often easy targets for cults, if surviving and helping younger passengers gave Grace a newfound sense of power then it's possible that she began to project nonexistent ideals onto Amelia and started convincing kids that the train is an escape, not a prison.
  • Sorta? Grace arrived on the train as a result of her parents' emotionally distant and dismissive relationship with her. After trying to act out to get any emotional response from them or even her ballet peers, her parents ignore the obvious cry for help, refusing to even speak to her before trying to cover up the shoplifting incident, at which point the train arrives for a Grace that feels alone and emotionally neglected. Her formation of the Apex was to help others, but it was also an attempt to create a group that depended on her and respected her.

Both Grace and Simon are victims of the sunken cost fallacy
The sunken cost fallacy is the idea that when someone invests in something (be it money, time, emotion, ect) then they will see it to the end to avoid feeling like they wasted their life on it. Word of God says book 3 will focus strongly on the idea of going forward with mistakes and not wanting to address the consequences. Simon and Grace arrived on the train while Amelia was in control so they got no explanation of how it worked and unless Apex had been around a long time and they only stepped into power relatively recently, both of them have likely been there for significant portions of their lives. They've had years to blindly guess how things work and settle into the wrong choice, getting their numbers as high as possible because they think that's what they should do. Knowing that they've been wrong and could have left years ago had someone told them what to do at the start means that everything they believe in is meaningless. That kind of news is hard to swallow. They could be either intentionally ignoring it or convincing themselves that they don't want to leave and neither should anyone else because accepting that they made the wrong choice is harder.
  • Partially confirmed. Grace realizes and remorsefully accepts that she's been on the wrong path and leading others down that path as well. Simon, meanwhile, clutches to their old ways until it leads to his death.

Finding out Amelia is just another passenger will destroy Grace's beliefs
Grace asserts herself as having the highest number on the train, while One-One created an explanation video for passengers he probably didn't doxx Amelia. So as far as Apex knows, the old conductor may not have been the original one but she could still be an entity of the train. Meeting Amelia or learning the truth about her in some capacity could be a Broken Pedestal moment for Grace that finally gets her to fully turn a new leaf.
  • The "Debutante Car" reveals that Grace was saved by the Conductor so if she learned the truth then yes, that would shatter her.
  • Sort of. They finally meet Amelia in episode 6, find out she was the conductor in episode 8 and find out the truth. Grace takes the truth surprisingly well while Simon goes into an angry denial phase.

When Grace said higher numbers make you powerful, she was being literal
From her perspective anyway. Apex worships Amelia as the conductor, Amelia who has numbers up to her neck and controlled the train for over thirty years. What if Grace learned about that somehow and got it in her head that whoever had the highest number became the conductor?
  • Sorta. It turns out that Grace essentially made up the idea of higher numbers being powerful after seeing Amelia's and wanted to emulate her, in addition to creating a group of people that would never leave her. By the end of the season, her number is greatly reduced and she begins to encourage the Apex kids that lowering them to leave is what they should do.

Simon will sustain lasting injuries during Book 3
The trailer shows a slab of debris falling and pinning him down while in the unfinished turtle car. From a narrative standpoint, part of why he and Grace haven't grown as people and faced their problems is because the only punishment the train can give is a higher number which isn't an effective deterrent for them. A serious injury such as several broken bones, or even permanent paralysis, could be a wake-up call to him, Grace, or both that they should want to leave the train.
  • ...Technically confirmed? Death counts as a lasting injury, from a certain perspective.

The Apex will turn against Grace and Simon
If Grace and Simon develop and eventually accept their flaws and the fact they are wrong about the train, it could cause the rest of the Apex to turn against them assuming they're Going Native or have been brainwashed by One-One. This in turn could be the final straw which causes it to sink in for them how badly they've messed up by indoctrinating dozens of children into an anarchist cult.
  • Given that the last two episodes are Grace and Simon wanting to reform the Apex, that is a possibility.
    • Zigzagged. Simon attempts to turn the Apex on Grace after he felt betrayed by Grace's growth as a person and orders them to grind her on the wheels, and trying to do it himself. After he pushes Grace over the railing after she saved him, the Apex kids essentially turn on Simon for his beyond the pale pettiness, and he dies horribly. The Apex then "disband" and begin to focus on lowering their numbers under Grace's leadership.

Grace and Simon both came from abusive households
It falls in line with a lot of their behavior. A lot of abusers were victims of abuse themselves, so Grace so easily and quickly being able to manipulate children could be because she was raised in that kind of environment. Both of them are unempathetic towards denizens of the train and act without remorse to them. Simon is shown to be fond of tiny figurines and victims of abuse are often drawn to childish things for the childhood they never had. Probably the biggest piece of evidence is how they both want to stay on the train, suggesting that they either have nothing waiting for them on the outside or want to stay away from their families.
  • Partially confirmed. It's shown that Grace came from an emotionally neglectful household, but we never see anything about Simon's life before becoming a passenger.

Hazel’s number doesn’t glow because she doesn’t remember what her personal problems are.
It’s implied in Book 1 and directly stated in Book 2 that the number on a passenger’s hand represents how close they are to reaching a breakthrough regarding whatever problem brought them onto the train in the first place, with the number decreasing as they continue to make progress but increasing if they allow their problems to fester. But you can’t exactly overcome or avoid your personal problems if you don’t even know what they are. Hazel’s number isn’t glowing because, sometime after boarding the train, she somehow lost her memories of why she boarded the train to begin with. Now her number is stuck as a 337 and won’t increase or decrease until she remembers the personal problems she needs to overcome. Considering the fact that the Apex believe that having your number increase is actually a good thing, Grace and Simon’s want to find out why Hazel’s number isn’t glowing is most likely prompted by their want to increase it, which won’t happen unless the number is glowing.
  • Zigzagged. The online bio states that she doesn't remember a lot of her past and her number is "defective". And then "The Color Maze Car" reveals that she's not human at all...

Hazel's personal issue is that she refuses to be her former self and wants to be acknowledged as a separate individual other than just a mental illness. Unfortunately, the train assigned her number to the original personality and her number will only change provided that she gives back control so the original can be treated.
  • Jossed. She's a failed clone of Alrick created by Amelia.

The reason the Apex are desperate with keeping their numbers up
It may be that they encountered One-One in the past, but took One-One's words of "getting their number down would mean they will be gone forever" literally and believe they were responsible for getting them stuck on the train, blaming them for the reason they can't go home, turning against the robot and taking their anger out on every denizen onboard. In short, One-One's thoughtless words created the Apex.
  • This is probably why One-One moved the Unfinished Car away so that he could actually find them and truly explain his mistake.
  • Jossed: One-One not only had zero effect on the crafting of the Apex's ideology, but he has no idea it even exists beyond a vague awareness of "oh, there sure are a lot of passengers in that one train car" ("I wonder if they're having a party!" "Or sulking about their inevitability high therapy bills".

Grace and Simon are going to meet up with Amelia
  • We all know that Episode 8 of a Book is the Wham Episode and the "Hey Oh Whoa Car" is where they learn a shocking secret. Meeting Amelia and learning that she was the Conductor and all that she created would really shake them to their core, making them realize that they were doing this All for Nothing.
    • Confirmed. They actually meet in episode 6, but Amelia does elaborate on the truth in episode 8. Although Grace takes the truth quite well, considering her calm demeanor, while Simon goes into angry denial.

Hazel is a construct meant to mimic the child Amelia could've had
  • Hazel is revealed to transform into a turtle at the end of "Color Maze Car". Turtles were Amelia's Animal Motif. Plus she has blond hair like Alrick. Perhaps Amelia tried making a human to make it feel like she'd be the daughter that would never be.
    • Adding onto this, it’s possible that humans aren’t even allowed on the Train unless they have a number. That’s probably why Hazel has a defective number; the Train registers her as both an inhabitant and a passenger. Therefore, she can’t ever leave the Train but she still needs to have a number.
    • Partially confirmed. She's the result of a failed attempt to recreate Alrick, and she contains traits of both. She wasn't an intentional creation, however, and Amelia isn't that fond of kids anyway.

Tuba's child Bugle will be a Chekovs Gunman
Bugle will appear in a future episode and will be trying to hunt down and take revenge on Simon after learning of her death. It's entirely possible this won't be in Book 3, but in Book 4.

One-One is trying to give Inhabitants Numbers to avoid another MT situation.
  • That’s why Hazel has a flawed number despite her not being human.
    • The Hazel's number is revealed to have been actually given by Amelia, so this theory is probably Jossed.

The Apex will be divided due to Grace and Simon's new perspectives
  • After the ending to "The Color Clock Car", we see that Grace's number decreased and Simon's number increased. Their conflicting ideals about what happened would split the Apex into two, with those who wish to truly leave the train being with Grace while those who wish to be anarchists stay with Simon.
    • And once they are divided, the civil war will overtake the train to the point One-One has to call Tulip back to the train to rectify the situation.
    • Jossed. When Simon orders the Apex to kill Grace, they side with her, and are horrified when he tries it, especially after she saved him. And they don't seem to brook argument with her when she announces that she intends to reform the Apex, with numbers starting to go down.

Alternatively, the entirety of the Apex will be reformed.
One of the currently unresolved flaws of the Train is the fact that it’s willing to pick up passengers who are too young to be left without adult supervision. This is evident by the fact that Grace and Simon boarded the Train when they were just 10 years-old at the oldest, and Simon had to be taken in by The Cat before Grace came into the picture. By the end of Book 3, Grace (and hopefully Simon) will reform the Apex into a kind of foster home for dependent younger passengers until they can leave the Train. Grace and Simon’s numbers are insanely high, so they’ll be on the Train for a while anyway and have plenty of time to watch over child passengers. But even if their numbers were to reach zero, they’ll probably decide to stay on the Train permanently due to an unwillingness to abandon the children who still need them and the fact that they most likely don’t even have lives outside of the Train to go back to anymore.
  • Unless you were to count Simon, this theory is likely confirmed. While we don't know what exactly what's going to happen down the line, as Grace may or may not decide to stay on the train, it seems that the Apex is on its way to becoming reformed.

Hazel is Amelia's daughter.
After reclaiming his memories. One One decided to give Amelia what she wanted as a companion. In the form of a Turtlefied Alric. They had a child together, somehow, that is Hazel.
  • Mostly jossed. One-One had nothing to do with Hazel, who certainly isn't the result of her having a kid with a turtle Alrick after One-One took back the train (the first three books take place over a single year). Hazel can be considered her daughter, though, as she's a failed clone Amelia tried to make of Alrick, and who has both of their traits. Not that Amelia would give her such a label.

Amelia was experimenting on passengers.
Turtles are Amelias accidental signature, and when distressed Hazel turned into a turtle creature.

Simon will become irredeemable when he realizes that his number goes up when he’s terrible to humans, not just denizens.
Confirmed, though we don't see him "realize" it per se.

Simon will suffer a Karmic Death.
And he'll go out the exact same way he did to Tuba: being wheeled.
  • Confirmed. While he doesn't get wheeled, he does die the way that set him on his Start of Darkness: he has his life taken from him by a Ghom.

Hazel is a failed attempt by Amelia to create a real person from her life.
She’s wearing the sweater vest and tie part of Amelia and Aulric’s old primary school uniform, and she uses Britishisms (I’ll be mother, Don’t be daft, etc.) despite not having an accent.
  • Confirmed. She’s a failed clone of Alrick.

Simon will blame Hazel for Grace’s change in personality.
Maybe he’ll think Hazel brainwashed Grace or that she’s simply a negative influence. He will then attempt to wheel Hazel, believing that Grace will go back to "normal" once Hazel’s gone.
  • Somwhat confirmed. He does blame Hazel, but focuses his anger on Grace herself for "betraying him" and goes over the deep end.

Simon will have a I've Come Too Far moment.
Regardless of whether or not the above WMG ends up Confirmed, Simon will break into a rant about all the horrible things he did on the train and claim that there’s no turning back for him now. After all, accepting the fact that he was wrong all these years and finally trying to improve himself as a person would just make everything he did (including murdering Tuba) utterly pointless. Tulip’s words to Amelia back in Book 1 will then come full circle as the latter gives him a You Are Better Than You Think You Are speech to try and convince him to start bringing his number down.
  • Jossed. Simon dies an unrepentant Psychopathic Manchild who just tried to kill Grace right after she had just saved his life. He arguably has a single moment of My God, What Have I Done? after the act, but he immediately tries to squash whatever guilt he has down with unhinged laughter.

Simon will realize his wrongdoings but will remain on the train.
Seeing Grace telling Hazel that they won't tell him about what happened will be the wake up call he needs to realize the impact of his actions. Considering that his number has only gone up throughout the book, unless there is a time skip, it seems highly unlikely that there's anything he can do in two episodes that would drop it down to zero. Simon could follow Amelia's suit in trying to make amends and eventually go back to The Cat.
  • Jossed rather HARD. Simon refuses to redeem himself, tries to kill Grace, and is killed by a Ghom. While there is a moment where he seems to cry, realizing that he seemingly kills Grace, he laughs it off.

So long as the Apex is still around, Simon and Grace won't be able to get their numbers to zero.
They take kids in and encourage them to be the worst version of themselves and do whatever it takes to raise their numbers. That has to be causing their own numbers to grow exponentially, right?Maybe confirmed? Grace disbands the Apex either way, which does cause her number to go down, but the season ends with it still in the triple-digits at best.

Hazel's status as a glitch will be fixed and she will join One-One in helping to run the train.
If her number is only printed on, then there's no way it can go down. However, Hazel has been a massively good influence on Grace so she could be recruited to talk to passengers and help guide them.
  • Jossed. If this happens, it won't be seen until a future book.

Grace will decide to stay on the train to look after Hazel.
Grace will get her number down to zero but will stay on the train to look after Hazel. She could also somehow become a Denizen, so Hazel doesn't outlive Grace.
  • Jossed. Hazel decides to leave Grace and go with Amelia to learn more about herself.

Samantha wasn't just Simon's companion, she was also his cat.
  • When Simon was taken as a boy, his only friend Samantha was brought onboard with him. The train then granted the cat the ability to talk and think like a person so she could help Simon on his journey, which did not go over well.
    • Jossed. The cat is at least 150 years old.

Amelia and Hazel will eventually have a mother/daughter relationship.
  • Maybe? Word of God says that they have a "unique" relationship what would have been explored in future books, but unless the show gets Uncancelled, we're never going to see it.

Simon will trap Grace in her own tape so she won't be able to protect Hazel
  • Feeling betray, Simon will trick or make Grace to look into her own tape and trapped her. Grace might be inside her own tape similar in Tulip's situation from "The Cat's Car". There are two outcomes for season 3 finale depending on Grace's fate:
    • One, Grace needs to remember her real memories in her own tape so she can return to reality and save Hazel.
    • Two, If Grace can't remember her past clearly and keep changing her past, she will be trap in her tape forever.
      • Mostly Confirmed.While Simon doesn't get Grace's tape, he gets technology which lets him extract and view the film memories in the same way. It's similar enough for Grace to be trapped. Also, Hazel has left by the time he does this. Fortunately, the first outcome with Grace escaping comes to pass.

    Book 4 Guesses 
Book 4 will prominently feature Amelia & Hazel
Episode 7 of the first 2 books introduced (not counting the cliffhangers) someone important the next book, and episode 7 of season 3 does the same by reintroducing Amelia who left with Hazel.
  • Going on this, a potential future Book would focus on Amelia learning to see Hazel as a person who deserves to live, and love her like the daughter that she and Alrick never got to have.
  • This would eventually lead to Amelia refusing to leave the train and that she will decided to live in the train.
    • Jossed. Book 4 features two completely new characters, Ryan and Min-Gi, with the creator later revealing Amelia and Hazel was being saved for much later.

Hazel will have a major change since Book 3
  • Since Tuba's death and losing Grace's faith, Hazel will have a very different appearance that will contrast how she is not the same person from before. She will have a different hair style, new clothes, and her personality will be similar to Amelia.
    • Jossed

Hazel will make her decision once Amelia finish her research on her in Book 4
Once Amelia finish her research on Hazel, she will either keep herself isolated in one of trains to live on the rest of her life or work with One-One and help future passengers to get their numbers to 0.
  • Jossed

Book 4 will have a timeskip
After Book 3 season series, the next book will be take place about a few years featuring the characters from Book 1-3 and how they are doing in the real world.
  • Tulip is high school student studying her career as a gamer, making new friends, and probably featuring a her love interest.
  • Lake and Jesse are currently dating, Lake now a high school student or working at a part time job and Jesse a collage student.
  • Grace finally got her exit and resume her peaceful life moving forward.
    • She will either tries visiting her parents to reconnected with them.
    • Grace moving on without them after her parents doesn't recognize or remember her after she went missing for seven years.
    • Grace will start a family of her own and make sure she won't end up like her parents.
    • Grace will find a way to meet with Simon's mother and break the news about his death.
      • Or Simon has older or young siblings Grace might meet and break the news about their brother's death.
  • Jossed; in fact, Book 4 takes place in the past!

Book 4 will feature the first confirmed LGBT character
The next main character will feature a LGBT character that involves their sexuality.
  • They are learning to accept their sexuality and it's who they are.
  • The main character tries to get over their ex cheating on them because of their sexuality.
  • This could possibly be confirmed. Book 4 - Duet has been confirmed and it features Ryan and Min, two young men with romantic undertones to their relationship as seen in the trailer.
    • Jossed; while you can argue that they have Ship Tease similar to Lake and Jesse from two book prior, just like them, no romance is ever confirmed by the end of the season.

Book 4 will elaborate what the Ghoms are.
The Ghoms are a grotesque, cockroach-like monster that literally suck the life out of people. They seem to prowl the wasteland that the train is riding through and are even found aboard the train itself, the sphere used to turn Atticus into one implying that they are some type of hostile denizen. When one successfully drains the life out of Simon, it self-destructs. If the Ghoms are some type of denizen, then them being able to successfully kill passengers seems counterproductive. It is likely that it self-destructed because it killed a passenger, or perhaps the supernatural nature of the train means that Simon did not die as much as was rendered into a new, temporary state.
  • Jossed

The Ghoms can sniff out and are attracted to numbers.
  • We only ever really see Ghoms attack passengers, naturally occurring Tulip when she tries to leave the train almost like a deterrent from trying to leave, while none appear when Lake and Mace - neither of whom have numbers - are wandering the wastelands. Later when Atticus is turned into one, he tries attacking Tulip and one tried attacking Simon when he was a kid. When Simon's number becomes so high that it covers his entire body, two Ghoms suddenly appear out of nowhere and try attacking Grace and Simon. This could mean that they are attracted to numbers, the higher the passenger's numbers, the stronger the "scent" and they go to where the closest scent they can find is. They could also act as a sort of omnivorous carrion feeder not unlike cockroaches are to decaying plant matter, the Ghoms all coming en masse to get Simon because his high number was a sign that he was a corrupting influence on the Train that needed purging for the other passenger's safety. With Amelia, she had the technological resources to keep whatever Ghoms that would have gone after her at bay, but Simon was not so lucky.

Simon will respawn.
  • The Ghoms are implied to be some type of denizen. The concept of a denizen is that they are a naturally occurring product of the train designed to help the passengers. Even if the Ghoms are made to deter passengers from leaving the train (as was what happened in Book 1) or simply give them a good scare, the idea of a denizen managing to successfully kill a passenger seems counterproductive. Considering the supernatural nature of the Infinity Train and its technology, it is likely that Simon did not die, so much as was transformed by it. Either one of two things could have happened:
    1. Simon was "reset" to his original number and now there is a Simon from the moment he was taken from the train, young and with no memory of all of the years he had spent with the Apex. Having been given a fresh start (this time with One-One's introduction video to give him an idea of what he is there for), he will be given a second chance of returning home.
    2. Book 4 will introduce a denizen that looks or behaves like Simon before his Sanity Slippage. The Train would have decided that he was beyond its help, but has rendered him in a form that will leave him out of the way and being able to fulfill a redeeming role, not unlike some of the monsters from Silent Hill who were once people reborn as monsters.
    • Jossed, if only because Book 4 takes place long before Simon was even born.

Book 4 will have Tulip, Lake and Jesse searching for the train to save the remaining humans.
Even for how bad the Apex were to Lake and Jesse, they still are troubled kids trapped on an infinite prison and Jesse probably wouldn't feel good just leaving them there forever. Lake would probably need convincing, but Tulip would be horrified at the idea of so many missing children trapped on the train and do what she could to help.
  • Jossed

Grace and several members of the new Apex will be stuck at 1 because they grew up on the train
The train will define “not wanting to leave the train” as a problem that still needs to be worked out, and Grace will take advantage of the loophole to create a stable organization of willing human passenger helpers.

The new Apex will rename themselves.
They will call themselves Nulls and will help the passengers get their number to zero and leave the train.
  • Jossed

Book 4 will focus on an ex-Apex member's reluctance to leave the Train
While I think a Time Skip featuring a teenage Hazel, or a story starring Hazel and Amelia in general would be cool, I think that's too obvious an avenue to immediately take for the next story arc. I feel like the next season will focus on the attempts of an ex-Apex member we've seen (like Lucy; I know she's a bit of a Self-Insert of one of the writers, but she's so dang adorable) working to get off the train, with them aiding a brand-new passenger along the way. Part of the plot might be the ex-Apex member struggling with the idea of leaving the train when they've made so many friends and have no fond memories (or few memories at all) of pre-Train life, so they continuously and knowingly self-sabotage themselves and their new friend so they can stay longer.
  • Jossed

There will be an episode that shows The Cat mourning Simon.
Either in the background or in a way actually observed by a protagonist, there will be a scene that is there to make us feel bad for Simon. Bonus points if there are any Ironic Echos to Tuba's funeral.
  • Jossed

The main companion of Book 4's protagonist will be a previously established denizen
I think it'd be a neat way to tie things into a previous Book in a low key way.
  • Jossed

The main protagonist of book 4 will be a denizen with a passenger companion like Lake from Season 2
  • Jossed

Amelia will discover or knows about the origin of the Infinity Train
At some point of her journey, Amelia would learn on how the Infinity Train was created. This is quite fitting for Amelia who has been in the train for 33 years so she could possibly know how the train was created.

The train is a combination of magic and science as Amelia would inadvertently resurrect magic in the train
As ridiculous as it sounds, it is possible that magic is also involved with the creation of the Infinity Train.

Book 4 will be the last story of Infinity Train and all the main characters of Book 1-3 will return to help Amelia to escape
  • Jossed. This is the last season, but it's a prequel prominently focusing on two new protagonists. Amelia does cameo, but she's only recently boarded the train at this point.

Book 4 will feature One-One and the Train in a directly antagonistic role
  • Jossed

Book 4 will have a Two Lines, No Waiting plot that will eventually become a Hyperlink Story where one protagonist outside the train is investigating the mystery of the Infinity Train, and the other being a loved one of a passenger finding themself aboard.
  • The protagonist of the first plot will visit the protagonists of previous books (including some of the Apex kids) for interviews in guest appearances, trying to investigate the train's history and secrets. Meanwhile, the deuteragonist is unable to cope with the disappearance of another passenger (possibly one of the Apex kids) until they suddenly board the train and eventually come across two other passengers without numbers (freighthoppers): one with a Split Personality who prematurely awakened inside their pod and broke out, wanting to be recognized as a separate being instead of just a mental illness, and the other being the one whom MT hijacked their pod from. Their denizen companions would all be one-shot, including the return of Atticus, Jesse's reflection working with Simon's (who pretended to become Mace and Sieve's replacement) to escape the Chrome Car, Driven by Envy of MT/Lake being able to leave the train, the deuteragonist's own literal shadow that eventually becomes a Living Shadow and separated from their prime, and King Aloysius (who reveals that one of his subjects had Happily Adopted Hazel, who is working under him as a protégé to learn more about their people).
  • When the plots hyperlink, the train will finally be revealed to the outside world and the book will end on a Merged Reality between the train's dimension and the outside world where the passengers and inhabitants (including Amelia, the rest of the Apex (including Grace), Hazel, and the rest of the reflections) can leave the train anytime they want. The deuteragonist also will finally be reunited with the passenger.
  • Jossed, though to give the above troper some credit, Owen did admit that one idea for this season was indeed a Two Lines, No Waiting plot (though both protagonists would have been on the train).

There would be a Crossover episode with Over the Garden Wall titled "The Unknown Car".
  • Wirt and Greg would make guest appearances in Infinity Train Art Shift style, finding themselves in the train car resembling the Unknown. With Wirt being the passenger while Greg is deemed as a freighthopper. It's revealed that the train over the titular wall is the Infinity Train itself and the crossover is an interquel between episodes 4 and 5 of Over the Garden Wall. The protagonist will have to work with the brothers to exit the Unknown Car.
    • Jossed, though this troper's friend made a good case for Book 4 sharing many ideas and theming with OTGW.

Ryan and Min's problem
  • They're in denial that their friendship is falling apart, but are too afraid to confront on them.
    • Confirmed: Their friendship is struggling and they need to work together to repair it.

Book Four takes place in the past.
  • Specifically, the 1980s. The scenery in the pre-train section, as far as we can tell from the trailer, looks 80s, and in a couple of shots Min-Gi seems to be playing a handheld synth from that period.
  • Most significant, though, is the fact that both Ryan and Min-Gi wake up on the train in the same jumpsuit that Amelia wears in book three, with the single-eyed One-One logo on the left breast. Perhaps all passengers were given these suits upon boarding before Amelia took over, and One-One started letting passengers keep their clothes after he was reinstated because he got to know Tulip and started to see passengers' individuality.
  • Confirmed

If it does take place in the eighties...
  • We might meet a unified One. (Confirmed!)
  • Young Amelia may return as a character, perhaps to save Ryan and Min-Gi from the Steward. (The former is confirmed, but her direct interactions with the duo are limited to her quipping at their unconscious bodies.)
  • If Ryan and Min-Gi are indeed having romantic feelings for each other, the time period will make everything harder. (Jossed)
  • If they both escape, we could have an epilogue scene in the real world where they, as established aging rockstars, play a concert which past protagonists attend. Unlikely but would be cute. (Jossed, but if I had a nickel for every fan fic that uses this idea...)

Ryan and Min-Gi wrote "When I Look At You, I See Me"
  • We know that they're aspiring musicians, and it appears that their on the train because of a strain on their friendship. Perhaps the train helping them to repair their friendship inspires them to write a song about it.

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