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"That's me, the world's strongest engine!"
— Diesel
"Is that all you can haul? Henry must be stronger."
— Troublesome Trucks

The World's Strongest Engine is the eleventh episode of the sixth season.


Henry has had an accident pulling a goods train and is sent to the works to be mended and unfortunately Diesel is the only spare engine available. The engines are not very happy about this, seeing that they know Diesel is troublesome.

The next day, as Diesel is working at the docks, he brags to the trucks that when the Fat Controller sees how good he is at shunting trucks, he will get rid of steam engines once and for all. The trucks tease Diesel as he is shunting them, saying how Henry can shunt more trucks than he is, so he boasts he can push them all at the same time.


Grease and oil!

Diesel then arranges a line of twenty trucks, but soon finds he is unable to move them (unbeknownst to him, a shunter has put the brakes on), so Diesel decides to pull them instead. He pulls so hard that he breaks loose and falls off the quay and onto a barge. Henry, who is now repaired, arrives at the docks with the Fat Controller. He is cross with Diesel and sends him home in disgrace.

Henry then pulls away from the docks, pulling the line of trucks easily and the engines all agree that even trucks can be helpful sometimes, like helping to get rid of Diesel.




  • S.S. Vienna from TUGS can be seen.
  • This episode may have been inspired by the magazine story, Showing Off.
  • This episode marks several things for Diesel:
    • His first speaking role since the third season episode, Tender Engines.
    • His only appearance in the sixth season.
    • The last time he was sent away. Stories afterwards state he is a permanent resident of Sodor.
  • In both the UK and US versions, Diesel's "HELP!" as he falls off the quay is later used for Duncan in the sixth season episode, Dunkin Duncan.
  • Salty was intended to have a role in this episode as he is seen in a deleted scene.


  • The term "trucks" is used in the American narration.
  • In the first scene, Clarabel is facing the wrong way.
  • One of the workmen who comes to rescue Henry is tilted.
  • At Tidmouth Sheds, the buffers behind Thomas are resting on top of the rails.
  • When Diesel pushes the trucks, his siderods are going forwards.
  • Diesel starts with three trucks and adds four more, but the narrator says he starts with five.
  • After shunting the trucks Diesel runs on the third line, but he should have traveled on the first line; the next scene shows the third line is blocked by the trucks.
  • When the camera moves with Diesel a wire is visible on his coupling.
  • As the trucks laugh, they are not in the formation that Diesel arranged them, but as they were before jeering at Diesel.
  • Diesel falls off the quay face-first, but lands back-first with Diesel 10.
  • When the Fat Controller looks down at Diesel, there appears to be a rip in his suit.
  • Henry took an incredibly short time to get repaired.
  • In the British narration Diesel calls Sir Topham Hatt the Fat Controller.
  • In the shot where Diesel's teeth were shown and his eyes are looking left to right you can see that his face is moving.
  • In a close-up of Diesel, the scene is reversed as you can see steam returning to Thomas.
  • Diesel could not have pulled the trucks anyway as the line he is on leads to a dead end.
  • Oliver and Duck have the same whistle sound.
  • Nothing is said about Diesel's driver after the accident.
  • During the final scene with Thomas and Percy, both of their roofs are crooked.
  • A brakevan should have been added to Diesel/Henry's train.


  • Books - Diesel and the Troublesome Trucks
  • Magazine Stories - More Mischief! and Sodor's Strongest Engine

In Other Languages

Language Name Meaning
Norwegian Verdens sterkeste lokomotiv The World's Strongest Engine
Danish Verdens stærkeste lokomotiv The World's Most Powerful Engine
Japanese せかいさいきょうのきかんしゃ The World's Strongest Engine
Slovenian Najmočnejša lokomotiva na Svetu The Most Powerful Locomotive in the World
Polish Najsilniejsza Lokomotywa na Świecie The Most Powerful Locomotive in the World
Italian La Locomotiva più forte del mondo The World's Strongest Engine
Russian Самый сильный паровоз The Most Powerful Locomotive
Chinese 世界上最强大的火车 The World's Most Powerful Train
Korean 망신 당한 디젤 Diesel Suffered the Embarrassment
Romanian Cea Mai Puternică Locomotivă Din Lume The Most Powerful Locomotive in the World
Slovak Najväčšia svetová lokomotíva The World's Largest Locomotive
Hungarian A Világ Legerősebb Mozdonya The World's Strongest Locomotive
Finnish Maailman Vahvin veturi The World's Strongest Engine
Swedish Världens starkaste lokomotiv The World's Most Powerful Engines
Thai หัวรถจักรดีเซลหมดพลัง Diesel Engine Exhaust the Power
Dutch De sterkste locomotief van de wereld The Strongest Locomotive of the World

Home Media Releases


DVD Packs


DVD Boxsets



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