History TearJerker / InfinityTrain

** As mentioned above, Simon originally got the idea of "increasing numbers = getting stronger" from Grace. And because of this misguided belief, Simon murdered denizens of the train (most notably Tuba) and committed other atrocities just to keep his number growing and become "stronger". It's possible that Grace is aware that, despite Simon being fully responsible for his own decisions and denial, she still ultimately had a hand in his descent into madness and villainy. In other words, if Grace had just admitted to not knowing what the numbers meant instead of being a KnowNothingKnowItAll all those years ago, [[ForWantOfANail the events of Book 3 (and some events of Book 2) would've never happened]].

** On Simon's side, we see what happened with him and the Cat, and Simon is clearly ''devastated'' when she abandons him in her panic, and only survives because of Grace. We also learn that Simon's number when Grace saved him was at 55. If he had known that his number was supposed to go down, he would've been able to leave sooner. Grace's lie about numbers = strength deeply affected him, and in the end, this ''one'' lie (as well as Simon's refusal to accept the truth) [[ForWantOfANail ended up killing him]].

** Speaking of which, even when Grace gets her number to 0, she must still live with the fact that everything that happened was on her: she lost everyone she loved, she made children become separated from their families longer than they should've been, and she's killed and injured numerous denizens during her time on the train all because she was too haught, too proud, too ''stubborn'' to ever admit that she wasn't the expert she claimed she was. No amount of redemption is ever going to erase all of her sins. There's also the fact that she's not even sure if her parents are still alive or if something happened to them so she ends up just as she started on her train trip: all alone and no one to guide her.

* Grace and Simon both came to the train as children. They are now undeniably adults. And even though Grace worked through some of her number, it is still big enough to wrap around her wrist and up her arm and she in her crusade has caused all those kids to raise their numbers as well. They'll be there for a long time, far longer than they should have. By the time they return, their families would have likely long since moved on (or worse). As for Simon, his family definitely will never hear from him again and Grace will have to break the news that he's dead ''because of her''.
** Speaking of which, even when Grace gets her number to 0, she must still live with the fact that everything that happened was on her: she lost everyone she loved, she made children become separated from their families longer than they should've been, and she's killed and injured numerous denizens during her time on the train all because she was too haught, too proud, too ''stubborn'' to ever admit that she wasn't the expert she claimed she was. No amount of redemption is ever going to erase all of her sins. There's also the fact that she's not even sure if her parents are still alive or something happened to them so she ends up just as she started on her train trip: all alone and no one to guide her.

* Grace ends up saving's Simon's life and he repays her by knocking her off. He soon starts to cry, possibly realizing he killed his best friend for years before completely snapping, going LaughingMad as his face is glowing with all those numbers. Even the Apex children are shocked that Simon would do such a thing.

* Doubling as a meta example; the fact that this was the last episode of the last season due to cancellation is also a tearjerker.

** Her blaming her parents for wanting to change when everything was perfect also ties into her desire to keep things the same, which is perfectly understandable when you remember she's only ''twelve years old''.

* Jesse finally gets his number down but where does that leave MT? He may be able to leave but as MT discovers, she doesn’t have a number and thus, cannot step through the portal and made even worse when Grace thinking that MT was ''hindering'' his progress, opened her compass. When Jesse disappears, MT starts to cry as the Reflection Police approach her from behind...

* In order to leave the Lucky Cat Car, Jesse and Lake need a thousand points. However, Lake notices that she's getting fewer points because passengers have the urgency to leave while denizen don't. Lake bemoans how practically everyone, even ''the train itself'', sees her as lesser or not her own person.

* Simon telling Lake "you're no person", showing just how little the Apex thinks of denizens in general.
* Jesse finally gets his number down but where does that leave Mirror Tulip? He may be able to leave but as MT discovers, she doesn’t have a number and thus, cannot step through the portal and made even worse when Grace thinking that MT was ''hindering'' his progress, opened her compass. When Jesse disappears, MT starts to cry as the Reflection Police approach her from behind...

* Mace [[BreakingSpeech mocking MT about wanting to leave the train.]] He laughs at how she tries to act like a passenger yet still is without a number. It only gets worse as Mace points out how Mirror Tulip helped Tulip and Jesse escape more than herself. How she may not even be living her own life and is just be another product of the train. Another reflection.

* In order to leave the Lucky Cat Car, Jesse and Lake need a thousand points. However, Lake notices that she's getting fewer points because passengers have the urgency to leave while denizen don't. Lake bemoans how practically everyone, even ''the train itself'', sees her as lesser or her own person.