Villain Overview

You'll be laughing on the other side of your boilers soon, silly Steamies!
~ Diesel 10 swore his return.
Make the most of tonight, Twinkle Toes, because you won't like tomorrow!
~ Diesel 10

Diesel 10 is one of the two main antagonists of the Thomas and Friends franchise (alongside Diesel). He first appeared as the main antagonist of the 2000 film Thomas and the Magic Railroad.

He is an extremely villainous diesel engine with a rooftop hydraulic claw nicknamed "Pinchy" who is noted by Thomas for being 10 out of 10 brutal strength and devious deeds. Diesel 10 is described to be a feared diesel throughout the Island of Sodor as he has been causing trouble for steam engines, but is also obsessed on wanting to destroy a magical steam engine named Lady. In the past, he deliberately caused her to crash, but although he badly damaged her, Diesel 10 failed to destroy Lady. He is Lady's archenemy as well as Thomas' main arch-nemesis above Diesel despite appearing after him.

In Thomas and the Magic Railroad, he was voiced by Neil Crone. In the TV series, he was voiced by Matt Wilkinson.


Thomas and the Magic Railroad

Years ago, Diesel 10 once visited the Island of Sodor and caused trouble for the steam engines while he was there. During his visit, he found Lady, a magical steam engine responsible for keeping Sodor alive, and chased her, eventually causing her to crash. Following the accident, Lady's caretaker Burnett Stone, hid Lady in his workshop and tried to restore her, but failed to bring her back up to steam.

Several years later, Diesel 10 returned to Sodor when the Fat Controller (Sir Topham Hatt) was on holiday, intending to find and destroy Lady again. He was first seen by Thomas and Gordon when he raced past them at Killaban Station, kicking up dust and dirt everywhere. Later, he brought his two sidekicks Splatter and Dodge to the railway, who were present when he was scheming. He caused several problems for the steam engines, such as dumping sneezing powder around Tidmouth Sheds and later demolishing the scaffolding that had been placed beside the shed that night, only to be terrorized and scared off by Mr. Conductor, who threatens Diesel 10 with a bag of sugar that he will put in his tanks to seize him up for good. Another problem occured when Toby rings his bell to distract Diesel 10, Splatter and Dodge after observing them discussing their plan to destroy Lady and the Magic Railroad as well as all of the other steam engines. Diesel 10, who is alerted by the noise, recognizes Toby and attempts to attack him using his claw Pinchy. Unfortunately for him and his cronies, Pinchy causes the shed to collapse, trapping them under its roof.

When Mr. Conductor later traveled across Sodor to find the windmill in order to search for gold dust, he was found and confronted by Diesel 10, who captured him and held Mr. Conductor over a viaduct with his claw, threatening him that he will deliberately drop Mr. Conductor to his death if he doesn't reveal the whereabouts of Lady and the magic buffers that lead to the Magic Railroad. However, Mr. Conductor manages to escape by cutting one of the cables connected to his claw with a pair of wire cutters, causing Diesel 10 to fling him across the island towards the windmill. Diesel 10 later appeared at the coaling plant and taught Splatter and Dodge a lesson about "how to stop being stupid", but accidentally got himself covered in coal in the process which caused the engines to laugh at him, much to his anger. When Junior was thrown into the air due to a strong wind while riding the windmill's sails, he landed on the roof of Diesel 10, who kidnapped Junior and gave him a ride across the island until they reached the smelter's yard. There, Diesel 10 flipped Junior onto James and attempted to push the two into a melting pit to their demises, but they are able to escape by using the last of Junior's gold dust.

After Lady was brought back up into steam by Burnett and returned to Sodor, Diesel 10, upon discovering she is alive again, eventually finds her with Thomas and attempts to carry off where he left off by intending to destroy Lady yet again after his previous attempt to do it in the past before ordering his sidekicks to support him. However, Splatter and Dodge, having a change of heart since they are tired of their master's attitude, abandon Diesel 10 for his actions and refuse to follow him, telling their boss to do his own dirty work. As Diesel 10 pursues Lady, who is supported by Thomas and Burnett, across the island while trying to attack her with his claw, the chase ends when the group finally reach the viaduct in which Lady, Burnett and Thomas managed to cross it safely as it starts to crumble and fall apart due to the world losing its energy. However, Diesel 10 fails to stop in time as he approaches the bridge and falls off due to the viaduct collapsing under his weight, but was able to use Pinchy to hold onto one of the sleepers of the dangling track. The sleeper somehow breaks regardless, sending Diesel 10 plummeting onto a barge full of sludge below, whereupon he is towed away downriver and out of sight in disgrace. It is unknown what happened to Diesel 10 as it is assumed that he was sent away by Sir Topham Hatt for his actions.

Uncut version

This scene showing P.T. Boomer on top of Diesel 10 was not edited for the final cut.

In the original cut, Diesel 10 was the secondary antagonist, with the main antagonist being a human named P.T. Boomer (portrayed by the late Doug Lennox). It was revealed that Boomer was the one who wrecked Lady instead of Diesel 10. When test audiences complained he was too scary for younger viewers, the film was edited (albeit not professionally) and all scenes with Boomer were removed, even though he can still be seen in a few of them.

In an early script for the film, the character was intended to be killed off. After falling off the viaduct, Junior would have used his magic bandana to turn Diesel 10 and Boomer into sludge.

Diesel 10 was originally going to be voiced by Australian voice actor Keith Scott (who is better known for voicing Bullwinkle J. Moose from The Adventures of Rocky and Bullwinkle and the narrator from George of the Jungle), but after the test screening, there were complaints about his voice being too scary for younger viewers, so Scott was replaced with Canadian actor Neil Crone.

Initially, Crone played Diesel 10 with a Russian accent, but this was deemed too offensive and replaced with a New Jersey accent.

Calling All Engines!

However, Diesel 10 returns later on, apparently not defeated once and for all. He briefly appears in Calling All Engines! as the former supporting antagonist. Though he was not really a villain within the work, he is still antagonistic towards Thomas, who eventually musters up the courage to ask Diesel 10's help in the construction of Sodor's airport. Diesel 10 aids in the construction on the pretense of proving himself to be useful. He later appeared in the stinger of Misty Island Rescue remarking that the steamies will "laugh on the other side on their boilers soon".

Other appearances

His latest appearance in Day of the Diesels.

His comment foreshadows the following feature Day of the Diesels with him as the main antagonist. During Day of the Diesels, Percy becomes depressed over Thomas befriending the new engine Belle and is won over by Diesel, who claims he can be Percy's new friend. Percy goes with Diesel to the Dieselworks (a place steam engines are informed to never go) and discovers Diesel 10 amongst the other diesels of the special. Ultimately, Diesel 10 manipulates Percy into siding with the diesels by playing with his sympathy in regards to the horrid condition of the Dieselworks. Percy progressively tries to help, such as enlisting Kevin the Crane from the Steamworks, but becomes more and more upset when he is unable to relate the diesels' situation and when Thomas becomes chummier with the new arrivals, Belle and Flynn the fire engines. Thomas is sent to retrieve Kevin once the truth comes out but is held prisoner at the Dieselworks.

Diesel 10's plot to take over the Steamworks as diesel territory succeeds and he mocks Percy as he and his cronies fool around on the Steamworks' equipment and sidings. Fortunately, Percy sets things right, even as the Dieselworks burns down in the process. Diesel 10 is then scolded by Sir Topham Hatt at the Steamworks who informs him that "some things are worth waiting for" (which oddly shames Diesel 10). The Dieselworks is rebuilt and Diesel 10 seems very happy about it. Though time will tell if he tries another attempt at evil-doing.

Despite returning to his villain status, Diesel 10 is still the victim of abuse within Day of the Diesels in how the automatic doors to his shed in the Dieselworks repeatedly close on him as he exits and enters it. In addition, his goal to take over the Steamworks is not entirely without sympathy. Whereas the Steamworks is kept well-maintained, fully-functional and in pristine condition, the Dieselworks was formerly dirty, run-down, and poorly-maintained. Considering these squalid conditions, it was only natural for the diesels to feel neglected by the Fat Controller (who in reality had been intending to rebuild it himself, but, owing to the pressures of running the railway, had been previously unable to).

However, Diesel 10 was soon back to his bad self again in The Missing Christmas Decorations, as he stole Christmas decorations from Tidmouth Sheds as the Dieselworks lack decorations. But his lack of patience once again got the better of him as it was later discovered that the Diesels were about to get Christmas decorations for their own. But they let the Steam Team have their decorations to replace the damaged ones after Percy got new wheels for Sidney, a diesel who has been hoisted up by a crane for two years waiting for his new wheels.

After that, Diesel 10 was not recently seen again after that. However, his claw, Pinchy appeared again, but not Diesel 10 himself.


Diesel 10 is an evil, conniving, manipulative, bullying and raving diesel locomotive. He absolutely despises steam engines, and would call them nicknames like "Puffball" and "Teapot". He is Sodor's strongest (but not quite largest) diesel, his power being enforced by his slightly malfunctioning claw, Pinchy. He can use this deftly, and is even able to use it to make a sculpture. Pinchy, though, seems to have a mind of its own, as it has been shown to "punch" Diesel 10 in the face from time to time, which he loathes. All engines, steam and diesel alike, fear or respect him.

Despite his brutality, some of his demeanour appears to have cooled, and his behaviour has apparently improved enough that Sir Topham Hatt allowed him back to the Island. He gets along enough with the other Sudrian diesels, but his efforts to help are often only when it suits his personal interest and he still harbors his scheming ways and anti-steam sentiments.


  • In an original version of the Thomas and the Magic Railroad script, Diesel 10 was to have been a new engine to the island, and Pinchy was going to be hidden beneath Diesel 10's roof. These were kept in the book, Diesel 10 Means Trouble, the magazine story Left Alone also possibly has him illustrated without his claw.
    • Also, when Neil Crone replaced Keith Scott as the voice of Diesel 10, he initially had a Russian accent. However, due to complaints from test audiences, who believed it could be considered offensive, it was changed to a New Jersey accent.
  • "Pinchy" was originally built with no gaps between its buckets, which carried onto early promotional arts/illustrations.
  • Diesel 10 only appeared in specials and movies until the seventeenth series, where he appeared in an episode for the first time. The seventeenth series also marked his final appearance in the series, though his popularity with the fanbase allows merchandise of him to continue production even after his discontinuation in media.
  • Outside of Thomas and the Magic Railroad, Pinchy has not been named, and is simply referred to as a claw.
  • Some of Diesel 10's production-made face masks are now owned by Twitter user.
  • Diesel 10 has had a few modifications throughout the television series. These include:
    • Calling All Engines!:
      • His pupils became bigger.
      • His brake pipe was removed.
      • The wipers on his front windows were removed.
      • His body is incorrectly fitted to his chassis at the front, leaving a gap above his front bufferbeam.
    • Misty Island Rescue:
      • The 'teeth' on his claw now interlock.
      • His upper bodywork is level once again, but fitted higher with gaps above both bufferbeams now.
  • In early concept art, Diesel 10 had his name painted on his side. In addition, his claw bucket was smaller, his arm was designed differently, and he had three brake pipes, whereas his final model only had one.
  • His Ertl toy depicts him as a BR Class 46 with an added claw. This is due to re-using Diesel 199's tooling but with modifications.
  • Diesel 10 is the first villain in the series' films and specials, to be an arch nemesis of the main protagonists.
  • Diesel 10's claw was briefly used during Rebecca's imagination scene in What Rebecca Does.
  • Despite Britt Allcroft claiming that it just popped into her mind, it is believed that Diesel 10's name is a reference to him being the tenth diesel engine to be introduced into the television series.
  • Diesel 10's horn sound was most likely reused from the "Theodore Tugboat" characters Philip and Filmore.
  • Diesel 10 had a total of eight facial expressions, one of which, a clenched face, was never shown on-screen. There have also been copies of some of his face masks as well.
  • Due to the limitations of his Gauge 1 model, the bottom half of Pinchy's bucket was unable to move until his return in CGI.
  • Diesel 10 didn't appear again in Thomas & Friends since The Missing Christmas Decorations because the writers and Mattel (the current owner of the series) probably thinks he's too scary for the audience (due to the show being targeted at younger children) which is ironic since P.T. Boomer got removed from Thomas and the Magic Railroad for the same reason.
  • In real life, adding in a hydraulic claw onto a diesel engine would most likely be considered illegal, if it was not approved by government authorities.


           Thomas and Friends Logo USA.png Villains

Troublesome Trucks | Diesel | Arry and Bert | Diesel 10 | Pete Tiberius Boomer | Spencer | Sailor John | Vinnie | Frankie | Hurricane | Baz and Bernie

Zorran | Bluenose | Johnny Cuba

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