Class 40, also known as The Diesel, D4711 (in the Railway Series), D261 (in the television series), or simply Diesel is a diesel who once came to the North Western Railway on loan from the Other Railway.


The Railway Series/Thomas & Friends

Class 40 was built at the Vulcan Foundry in Newton-le-Meadows, Lancashire, England. Class 40 was sent to Sodor in 1962 to assist the engines with goods and express work toward the end of Stepney's visit, but he only insulted the other engines by saying they were out-of-date, and bragged about his modernity. He got his comeuppance when an inspector's bowler hat jammed in his air intake, causing him to break down and be as sick as boiler sludge. He sulked in the shed while Duck and Stepney took the Express for him.

While everyone was fare-welling Stepney, Class 40 crept away, leaving behind "a rather nasty smell of bad manners and a battered bowler hat".


Class 40 is snobbish, believing that diesel engines should take over from steam engines. Despite this, in the magazine stories, there are some occasions in which the Diesel helps the steam engines.

Technical Details


Class 40 is based on a BR Class 40 1Co-Co1. Old Stuck-Up and D782 are other members of this class. Class 40's television series number belonged to a real Class 40. The real D261 entered service on the 26th of February 1960 and was withdrawn from service in 1983, being scrapped at Crewe in March the following year. It was renumbered to 40 061 in 1973. Seven Class 40s are preserved, the first built, D200, at the National Railway Museum.


Class 40 is painted in British Railways' two-tone green livery with a black roof and yellow warning panels. In the television series, Class 40 is painted in British Railways' Brunswick green livery, with a thin, lighter green stripe running along his top and yellow warning panels. His number is painted on his cab sides in yellow.

In the Railway Series, his face was yellow, while in the Television Series, it was grey like the other engines.


Voice Actors

He plays The Wolf in The Sword in the Stone (ThomasTenCents34526's Style)

  • He is a hungry wolf, who tries to eat Wart, but misses every time, then falls into the water, gets stuck in a log, and floats away.

He plays Cyclops in The BernardBob MousePants Movie (ThomasTenCents34526's Style)

  • He is a monstrous cyclops, who wants to turn Patrick and Spongebob in ornaments, but fails when the things come alive and attack them.


  • Class 40's Railway Series livery is inaccurate as none of the Class 40 diesels received British Railways two-tone green livery.
  • According to some VHS descriptions for Bowled Out, Class 40 was brought to Sodor to take over Daisy's work while she was ill.
  • His Hornby model depicts him as a Class 37 diesel.



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