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    Diesel 

https://static.tvtropes.org/pmwiki/pub/images/disappearingdiesels99.png

"Your worthy Sir Topham Hatt thinks I need to learn. He is mistaken. We diesels don't need to learn, we know everything. We come to a yard and improve it. We are revolutionary!"

Voiced by: Michael Brandon (US; Seasons 13-16), Martin Sherman (US; King of the Railway - Season 18), Kerry Shale (UK; Season 13 - present US; Season 19 - present)

Basis: British Railways Class 08 0-6-0DM

Built: 1952

The first diesel to visit the Island of Sodor, Diesel believes that diesels are better than steam engines, and wanted to "revolutionize" Sodor. He left and came back several times before becoming a permanent part of the railway.

  • Adaptational Villainy: In the books, Diesel was merely a pompous bully, and, after one return to Sodor, managed to redeem himself. In the series, he returned permanently, though proved as nasty as ever, and gleefully bent on having all steamies sent to the scrapyard. He tamed closer to the books' version in the HiT seasons.
  • Aesop Amnesia: No matter how many times he learns about being nice to other engines, he'll soon return to his bullying ways.
  • Alliterative Name: His name in the marketing, Devious Diesel.
  • Anti-Hero / Anti-Villain: In rare instances, he's portrayed as an engine that wants to do good work and be recognized for his talents, but doesn't know the right way to do so and ends up hurting or upsetting others.
  • Arch-Enemy: Though antagonistic to almost everyone, he seems to direct most of his enmity and rivalry towards Thomas in the HIT seasons. His main enemy in his initial appearances was Duck.
  • Arc Villain: Of the three-episode arc with Duck as the main protagonist: "Pop Goes the Diesel", "Dirty Work", and "A Close Shave", though he doesn't appear in the last one.
  • Ascended Extra: He appeared in one novel of The Railway Series and a standalone story by Christopher Awdry. In the show (especially in later HIT seasons), he makes regular appearances and is a key antagonist.
  • Attack Hello: In "Springtime for Diesel", his way of saying "hello" is by deliberately bumping into other engines.
  • Bitch in Sheep's Clothing: In his debut episode "Pop Goes the Diesel" where he effortlessly charms the other engines into believing he's a nice guy then reveals his true colours in the next episode.
  • The Bully: What he becomes in the new series. He gets the enjoyment of heckling and harassing other engines.
  • Dark Messiah: In his first episode, he comes to Sodor preaching the diesel revolution.
    • Touched on lightly again in "Blue Mountain Mystery" where after hearing of Luke's Dark and Troubled Past, he convinces Paxton he is dangerous and must be gotten rid of.
  • Devil in Plain Sight: He's the most Obviously Evil character among the recurring cast, is willing to ruin jobs for glory or petty revenge, and any hint of possible reformation is gone by the next episode, yet he's still is allowed to live and work on the railway.
  • Does Not Know How to Say "Thanks": In "Disappearing Diesels". He settles for a friendly smile instead.
  • A Dog Named "Dog": A diesel named Diesel.
  • Establishing Character Moment: In his introductory episode, in which after smoothly flattering all the other engines, he says the above quote to Duck about how diesels "don't need to learn" and are "revolutionary".
  • Evil Cannot Comprehend Good: He couldn't understand why Paxton would help him after one of his pranks, nor could he comprehend Daisy and Harvey's Odd Friendship (Which he himself instigated)
  • Evil Wears Black: He has black paint and he's a huge jerk.
  • Fantastic Racism: To the steam engines.
  • Flanderization: Diesel saw diesels as revolutionary originally, but it was not his main vendetta against the steam engines, and he was rather shrewd and manipulative in his antics. Shortly into the TV made episodes however, Diesel became a more outspoken bully and exaggeratedly racist towards steamies. The current episodes seem to be toning him back down, even if he is still a much more obnoxious heckler than initially.
  • The Heckler: Sure to be found making fun of whatever the spotlighted engine is doing, often triggering their insecurities.
  • Hidden Heart of Gold: Played with in "Diesel and the Ducklings". He thinks that diesels should be rough and tough, but shows his soft side towards some ducklings.
  • Jerkass: The most prominent one of the show.
  • Jerk with a Heart of Gold: The newer series has played with this in "Diesel's Special Delivery", and in the Arc-animated episodes "Diesel and the Ducklings" and "Springtime for Diesel". Christopher Awdry's stand alone novel "Thomas And The Evil Diesel" also gave him a redeeming moment helping a derailed Clarabel. It's implied in "Disappearing Diesels" that he simply doesn't know how to be nice, even if he tries.
    • Even before the CGI series, there was what ended up happening in Emily & The Special Coaches. See for yourself.
      • Since HIT's takeover over the show, Diesel tends to get a Pet the Dog moment roughly Once a Season. His antagonism towards the other engines is also more petty and he will occasionally admit a begrudged respect for steamies such as Thomas.
  • Joker Immunity: A G-rated example. In contrast to his Railway Series counterpart (who was sent packing the moment the Fat Controller could deduce he was the one spreading lies in the yard), Diesel is never sent away again or receives any severe punishment, despite all of the trouble he causes with no sign of reformation.
  • Karma Houdini: Though this is soundly averted whenever he does something bad, the fact that he's still allowed on Sodor despite his terrible track record (and having been sent away multiple times) is probably a downplayed version of this. He is sometimes shown getting away with minor heckling as well, especially if the engine he victimizes isn't acting saintly either.
  • Kick the Son of a Bitch: Sometimes Diesel's heckling is directed towards haughty engines or even ones that bite first. Fantastic Racism is a prominent issue among many steamies and diesels, Diesel's just one of the worst cases.
  • Manipulative Bastard: Renowned for this, most infamously in his debut, he tells jokes about the big engines to the trucks, and tells them that Duck shared them with him. Once the trucks starts laughing at the other engines, they're convinced Duck had been spreading nasty jokes about them. Despite being found out and punished, he still somehow manages to smooth talk engines into trusting him (eg. convincing a lonely Percy into helping the Dieselworks in "Day Of The Diesels", or sweet talking Mavis into doing odd jobs in "Thomas The Quarry Engine").
  • Never My Fault: Hates being reprimanded for his mistakes, and will always find a way to shift the blame onto other engines. This gets especially bad in season 23's "Diesel Do Right" where after he's punished by the Fat Controller for not doing his job correctly, rather than own up to his failure and work harder, he decides to trick Rebecca into doing the other diesels' jobs wrong.
  • Obviously Evil: In the Mitton directed seasons anyway. While the books left it more imagination, the show version's demonic smile, sinister Leitmotif and shady voice over from the narrator leave little doubt from the first time he's shown that he probably isn't a Nice Guy.
  • Offscreen Karma: In "A Close Shave" where the Fat Controller found out about his lies about Duck telling names about the other engines and sent him away to the other railway. Averted in "Diesel Does It Again" and the later episodes where Diesel is seen being reprimanded by The Fat Controller for causing trouble again.
  • Out-of-Character Moment: "Diesel's Special Delivery", in which Diesel broods over not getting clapped and cheered by children as much as James does.
  • Pet the Dog: One episode per season, before he snaps back into his usual Jerkass personality.
  • Red Baron: In promotional material, he is often referred to as "Devious Diesel". Within the show itself, this nickname is rare, but not completely unheard of.
  • Ship Tease: He has some with Daisy in season 21. In "Springtime for Diesel", he feels guilty about bumping her and admits that he likes her while she's (pretending to be) asleep at the Dieselworks, and made a genuine effort to become her friend. At one point in "A Most Singular Engine", he blushes as he says her name.
  • Smug Snake: He pulls short sighted schemes to get rid of the steamies.
  • Team Rocket Wins: Sometimes gets to pull specials and look splendid at last. "Diesel's Special Delivery" for example. "The Railcar and the Coaches" also ends with him temporarily taking over Thomas' branch line after Annie and Clarabel misbehave.
  • Ungrateful Bastard: When Duck stands up for Diesel when the trucks were singing a rude song, he blames Duck for, ahem, 'making the trucks laugh at him'.
  • Visionary Villain: Started off as one, with it returning every now and then.
    Diesel: "Your worthy Sir Topham Hatt thinks I need to learn. He is mistaken. We diesels don't need to learn, we know everything. We come to a yard and improve it. We are revolutionary!"
  • Worthy Opponent: He displays some begrudged respect for some of the steamies, most often Thomas.
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    BoCo 
https://static.tvtropes.org/pmwiki/pub/images/185px-wrongroad18_4745.png

"Stop! You're making me giddy!"

Number: D2, Originally D5702

Basis: British Railways Class 28 Co-Bo

Built: 1958

A metropolitan-vickers diesel who works on Edward's station. Was initially referred as "The Diseasel" by Bill and Ben and was the subject of their tricks until Edward soon put a stop to their games.

  • Chuck Cunningham Syndrome: In the television series, his last appearance was in Season 5's "Double Teething Troubles". He has made cameos in various Thomas Creator Collective videos since.
  • Dark Is Not Evil: Bill and Ben thought he was a trouble-making diesel stealing their china clay trucks until he explained he had mistakenly took them and didn't know it was theirs.
  • Flat Character: He's essentially just a diesel version of Edward.
  • Meaningful Name: His name comes from his wheel configuration, Co-Bo.
  • Nice Guy: He is once of the nicest diesels.
  • Reused Character Design: His faceplates are the same as Daisy, sans eyelashes and makeup.
  • Team Dad: To Bill and Ben.
  • Younger Than They Look: Despite keeping Bill and Ben in order. He is in fact 10 years younger than the twins.

    Mavis 

https://static.tvtropes.org/pmwiki/pub/images/denanddart36.png

"If we use the teensiest bit of Toby's line, we can save all this bother."

Voiced by: Teresa Gallagher (UK; Hero of the Rails - present, US; Season 17 - present), Jules de Jongh (US; Hero of the Rails - Blue Mountain Mystery)

Number: Fharquay Quarry 1

Basis: British Railways Class 04 0-6-0DM

Built: 1962

A feisty diesel that works at the quarry. She started off as a cheeky young engine who thought she knew what was right, but matured into a kinder and more motherly engine over time.

  • Ascended Extra: Only got a few stories to herself in the books, but has plenty of focus in the television series.
    • She ends up playing an important role in Hero of the Rails. In an effort to prevent Spencer from finding out about Hiro, Thomas and Percy send him to the quarry and Mavis guides him to back up right underneath the operating slate hopper so he had to be taken for repairs at the Steamworks.
  • Character Development: She became more of a Nice Girl in season 6.
  • The Confidant: Plays this role to Salty in "Salty's Secret", where he tells her about how he feels he isn't fit to work at the quarry and longs for the sea.
  • Jerk with a Heart of Gold: Started off as this in her debut season.
  • Mouthy Kid: Started off arrogant and refused to follow Toby's orders. She tamed after her re-innovations to how things worked caused serious problems.
  • Nice Girl: She eventually became this. She's also one of the most kind-hearted diesels.
  • Ship Tease: With Salty in his debut episode. Unlike Bill and Ben, she treated him with kindness, and served The Confidant to him regarding his desire to be at sea.
  • The Smurfette Principle: Until the movie, she and Daisy were the only female engines, neither of whom appeared very often.
  • Team Mom: Was this occasionally with Bill and Ben, but now plays this role with most other engines.
  • Tomboy: Compared to the other female engines, she's not feminine at all. In fact, the only feminine things about her appearance are her cowcatchers and sideplates, which kind of resemble a skirt or a dress.
  • Took a Level in Kindness: The show mellowed her out significantly so she is often the prime White Sheep of the diesel ensemble.
  • White Sheep: She is easily the most kind-hearted diesel on the show currently.
  • Younger Than They Look: Compared to her later Team Mom persona. Especially noticeable in the Japanese dub, where she has a rather high pitched and childlike voice.

    'Arry and Bert 

https://static.tvtropes.org/pmwiki/pub/images/screen_shot_2018_10_30_at_94801_pm.png

"Got you this time, Stepney. You'll make very fine scrap indeed. Buffer 'im, Bert!"

Voiced by: Kerry Shale ('Arry, Season 14-present; Bert, Seasons 14-16), William Hope (Bert, Season 17-present)

Basis: British Railways Class 08 0-6-0DM

Built: 1952/1962

Also known as the Smelter Twins, 'Arry and Bert work at the scrapyards and are bullies to all steam engines. Multiple times, they have threatened and shown desire to smelt down the steam engines for good.

  • Affably Evil: Over the years they've become less evil, but remain bullies toward the steam engines.
  • The Bullies: Like Diesel, they are obnoxious hecklers to the steam engines.
  • Co-Dragons: They play to role to Diesel, in the HIT Entertainment episodes anyways.
  • Creepy Twins: Played this role in Stepney Gets Lost, but have been toned down later on.
  • Demoted to Dragon: They often tend to work alongside Diesel in the Hit episodes.
  • Fantastic Racism: Like Diesel, they seem to dislike steam engines, even trying to scrap Stepney.
  • Identical Twin ID Tag: Bert has stubble, while 'Arry's clean-shaven.
  • Jerkasses: They're terribly rude, rough, and antagonize the engines just as much as Diesel does.
  • Jerk with a Heart of Gold: They have their moments. For example, they enjoyed Diesel's ducklings in "Diesel and the Ducklings", and in "Springtime for Diesel", they seemed genuinely concerned when they heard that Daisy might have to be scrapped if she can't be repaired.
  • Karma Houdini: In their earliest appearances, they actually got away with harassing the other engines and getting them into trouble. Usually subverted in later seasons, though like Diesel, they sometimes still get a free pass for petty heckling, (especially towards an equally obnoxious engine).
  • Perma-Stubble: Bert.
  • Single-Minded Twins
  • Suspiciously Similar Substitute: To Splatter and Dodge from Thomas and the Magic Railroad.
  • Those Two Bad Guys
  • Villain Decay: In "Stepney Gets Lost", they take great glee in almost scrapping Stepney. This murderous depiction was never seen again in the series proper, which instead reduced the characters to mere bullies.

    Diesel 10 
https://static.tvtropes.org/pmwiki/pub/images/themissingchristmasdecorations11.png

I can do whatever I want! I'll get him too! With Pinchy!

Voiced by: Neil Crone (Thomas and the Magic Railroad), Matt Wilkinson (Day of the Diesels - present)

Basis: British Railways Class 42 'Warship'

The major antagonist of Thomas and the Magic Railroad. A large warship diesel with a mechanical claw on his roof, he was out to destroy Lady and Mr. Conductor, but was defeated thanks to Thomas. He has returned several times in the show's run as a permanent part of the railway.

  • Affably Evil: By the time of Day of the Diesels where his evil ways are mostly put on the wayside in favor of him being rude, but just trying to look out for his diesel brethren.
  • Big Bad: In Thomas and the Magic Railroad, and Day of the Diesels.
  • Brooklyn Rage: In The Movie, an odd contrast to his smooth Evil Brit voice in later appearances.
  • Cartoon Creature: While he's based on a real locomotive type, his claw is purely a fantasy creation with little to no practical use. In fact, such a modification is actually a breach of regulations since it would make him unable to fit through standard-height tunnels.
  • Cheated Angle: In the model series, his nose is tilted more towards his left eye. This was averted when the CGI series came.
  • Demoted to Extra: He has disappeared from the series after season 17's "The Missing Christmas Decorations", for reasons unknown. Although, Pinchy does appear in an Imagine Spot in season 22's "What Rebecca Does", and Mattel still sees him as a lucrative character, seeing as he's merchandised to death despite not being on the show all that often.
  • Depending on the Writer: He's either an evil, deiselist brute who is out to destroy all steam engines, or simply a rude Jerk with a Heart of Gold who doesn't like "steamies" all that much but is still willing to help out when it counts (and when he can get something out of it for himself or for the other diesels.)
  • Devil in Plain Sight: The steam engines all can tell he's clearly evil, but the Fat Controller keeps him around for reasons unknown. Downplayed in the series, where he is still a devious schemer, but his attitude leans more towards Jerkass/Jerk with a Heart of Gold than than just outright evil.
  • Disney Villain Death: Not a death per se, but his demise is brought around by falling off a viaduct.
  • A Dog Named "Dog": He's a diesel who's name is Diesel, but he has a number to distinguish himself from the other Diesel.
  • Establishing Character Moment: In The Movie, he roars through as station, kicking up dust shouting "Get outta my way! I have unfinished business here and I wanna finish it FAST!" He also leaves Gordon, of all engines, shaking in fear.
  • Evil Brit: In the US dub of the television series, due to keeping his voice from the UK series.
  • Evil Laugh
  • For the Evulz: Dumping sneezing powder all over Tidmouth Sheds Yards has got to be this.
  • Gambit Roulette: His plans in Day of The Diesels rely on circumstance he could have hardly picked out.
  • I Call It "Vera": He calls his claw "Pinchy".
  • Jerk with a Heart of Gold: His characterization in Calling All Engines.
  • Large and in Charge: He is the self elected head of the diesels by Day of the Diesels, and he's a warship diesel.
  • Large Ham: In both The Movie and Season 17.
  • Laughably Evil
  • The Nicknamer: He calls Splatter and Dodge collectively "Splodge", because he "ain't got time to say both names". He calls his claw "Pinchy", Thomas "Puffball", Toby "Teapot", the rest of the steam engines "Tin Kettle", and Mr. Conductor and Sidney "Twinkle Toes".
  • Obviously Evil: He has a menacing claw on his roof.
  • Silence, You Fool!: When his entourage are bickering in Day of the Diesels, he shouts them quiet. Also prominent in Thomas and the Magic Railroad.
  • Vile Villain, Saccharine Show: Compared to the actual series, where most of the bad guys were easily controlled by the Fat Controller, Diesel 10 in The Movie with his plans of destroying all steam engines is much more dangerous. Dialed back in later televised appearances, where he's more just a trouble making bully.
  • Well-Intentioned Extremist: Essentially the motivation for his actions in the CGI Series, he just wants the diesels to receive more attention since they always appear to be neglected, and he seems to apologize if he's made a mistake (i.e. giving the Steam Engines their own decorations since he ruined theirs thinking that the Dieselworks wouldn't have any decorations).

    Paxton 

https://static.tvtropes.org/pmwiki/pub/images/185px-gordonrunsdry9_42.png

"Hi, Stephen. Thomas lost his puff and I'm trying to find it and...well, I thought that might be...the lost puff...up there..."

Voiced by: Steven Kynman

Basis: British Railways Class 08 0-6-0DM

Built: 1952/1962

A soft-natured, if somewhat ditzy diesel who works with the Narrow Gauge engines in Blue Mountain Quarry. Friendly towards steamies, but tends to hang with a bad crowd.

  • Ascended Extra: Started as a Merchandise-Driven extra. Following "Blue Mountain Mystery" he's a recurring supporting character and has even been granted his own limelight episodes.
  • Attention Deficit... Ooh, Shiny!: Even worse than Thomas. Look at that duck!
  • Big Damn Heroes: In Blue Mountain Mystery, just as Diesel rats out Luke to the Fat Controller, Paxton arrives with Victor, who clears up everything.
  • Characterization Marches On: In his earliest appearances, Paxton was a background associate of the other diesels and often joined in heckling or tormenting other engines. "Blue Mountain Mystery" onward, his meek kindly persona is established.
  • Cloud Cuckoo Lander: Usually spacey, though he has occasional moments of clarity. He tries to warn Gordon to have his leaking boiler checked in "Gordon Runs Dry" for example.
  • The Ditz: He is easily distracted.
  • Extreme Doormat: Though he will often ultimately draw the line when pushed into callous acts.
  • Foil: Both him and Diesel are both Class 08's, and Paxton is simply the kind, yet ditzy counterpart to the callous and manipulative Diesel.
  • Kindhearted Simpleton: He is ditzy, but is one of the kindest diesels around.
  • Minion with an F in Evil: To Diesel in "Blue Mountain Mystery". Also to Diesel 10 in "The Missing Christmas Decorations".
  • Nice Guy: "Blue Mountain Mystery" onward.
  • Toxic Friend Influence: Hangs around with other more antagonistic diesels. Diesel in particular has been shown able to manipulate him into doing immoral deeds.
    • Ends up playing this himself in "The Lost Puff" when he convinces Thomas to play on the damaged tracks. He is horrified when it causes an accident however.
  • Windmill Crusader: Seems to be a recurring pivot in his limelight episodes, Comically Missing the Point in some way or other and going on a wild goose chase, be it for "lost puffs" or disappearing diesels.
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    The Diesel (D261) 

https://static.tvtropes.org/pmwiki/pub/images/e8e7a966b16355d3b7f3faa1e9709b36.png

"Not bad. I've seen worse. At least you're all clean."

Number: D261/D4701 (Book only)

Basis: British Railways Class 40 1Co-Co 1

Built: 1958/1962

A diesel who was sent to Sodor to help the engines, but insults them by saying they were out of date. He gets his comeuppance as he breaks down by an inspector's bowler hat. The Diesel crept away and leaves behind "a rather nasty smell and a battered bowler hat".

    Dennis 

https://static.tvtropes.org/pmwiki/pub/images/b4e6c4df222a009469790edf3210c8a2.png

"...I'm a really lazy engine..."

Number: 11001

Basis: Bulleid No. 11001 0-6-0DM

Built: 1949

A diesel who is lazy. He takes advantage of Thomas by letting him do his work for him, but after he reversed into a ditch, he learns his lesson, and with the help of Thomas, he gets his work done, and promises to be a Really Useful Engine. He has a twin named Norman.

    Norman 

https://static.tvtropes.org/pmwiki/pub/images/51a6c597458d503b38cedc606147f82f.jpg

Voiced by: Keith Wickham

Basis: Bulleid No. 11001

An orange-red Diesel and is Dennis's twin.

  • Ascended Extra: Somewhat in The Great Race, where he nearly has a collision with Thomas.
  • Big Ol' Unibrow: He has one.
  • Demoted to Extra: He was introduced as a Merchandise-Driven character in Day of the Diesels, and was promptly banished to background appearances with no speaking roles shortly afterwards.
  • Nice Guy: In comparison to his twin, he is much kinder and more of a hard worker.
    • He's even nice to the steam engines.
  • Polar Opposite Twins: Him and Dennis. Unlike Dennis who works fine, but is very lazy, Norman wants to be Really Useful, but breaks down often. While Dennis has two eyebrows, Norman has only one.

    Sidney 

https://static.tvtropes.org/pmwiki/pub/images/5ddb6c7e98c24d5fec87987dc4bb5e04.png

"What about me? I'm a decoration!"

Voiced by: Bob Golding

Basis: British Railways Class 08 0-6-0DM

Built: 1952/1962
  • A Day in the Limelight: In Sidney Sings and The Case of the Puzzling Parts.
  • Ascended Extra: He was promoted to the recurring cast in season 20, starring in his own episode, and has made many appearances since then.
  • Butt-Monkey: He spent two years on a hoist before getting new wheels.
  • Forgetful Jones: Sidney's known for being forgetful, even forgetting how long he's gone without his wheels.
  • Kindhearted Simpleton
  • Minion with an F in Evil: Much like Paxton, he seems pretty docile and somewhat simple, despite hanging around with the other more antagonistic diesels.
  • Put on a Bus: He hadn't been seen in any episodes between "Day of the Diesels" and "The Missing Christmas Decorations", spending two whole years unable to move because he lacked wheels.
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