Diesel 10 is a large diesel who lives and works at the Dieselworks

Diesel 10


BR Class 42


British Railways


BR Swindon Works




In Adventures on Rails, he arrived on Sodor around 1962 to help with construction of the Dieselworks and restoration of Vicarstown. He was allowed to stay, and usually spends most of his time at the Dieselworks cleaning up and keeping Den and Dart in order. He will play a role in the upcoming cliffhanger between the eighteenth and ninteenth seasons.


Diesel 10 is an evil, conniving, bullying, and psychotic monster. He absolutely despises steam engines, and would call them taunting names 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. All engines, steam and diesel alike, fear and respect him.

Despite his aggressiveness, he will help on occasion since Sir Topham Hatt brought him back, but only when it suits his personal interest. He can have a caring side, but he very rarely shows it.

In Thomas the Slender Engine

Diesel 10 inhabits Slendington (Dusk) with Brewster.

He is an enormous robot that retains his usual colors and Pinchy.

In Five Nights at Smudger‘s 4/World: Engines At War

Diesel 10 is an antagonist that is introduced on Night 4. He will attack from the window behind the player. They must throw Sugar at him until he disappears. The closer he is, the more sugar that needs to be thrown. If he gets too close and is not warded off, he will jumpscare the player by chomping Pinchy in their face.

Voice Lines

  • “Look out!” (During the Cutscene before Night 4)
  • ”Here I come! Duck, Pinchy! Hahahahaha!” (After the Phone Calls on Nights 4 and 5)


Adventures on Rails


Sodor Adventures

The Adventures on Sodor


  • According to The Real Lives of Thomas the Tank Engine, Diesel 10's hydraulic claw, Pinchy, is an illegal modification. Among other reasons, it makes him too tall for the British loading gauge.
  • In an original version of the Thomas and the Magic Railroad script, Pinchy was going to be concealed beneath Diesel 10's roof. This is kept in the book, Diesel 10 Means Trouble.
  • In Thomas the Slender Engine, Spencer pinned the blame on Diesel 10 for mutating the other engines.


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