Out of all The Sir Topham Hatt engines the lucky one selected was Thomas the train to show Belle the tank engine around the Island. Percy the small engine thinks Belle the train is going to take his position as Thomas tank engines best friend.

The Sodor Diesels observe this misunderstanding taking Percy the train with them to an old ramshackle of a place in Vicarstown, the fire colored glowing-red Sodor Dieselworks.

The Sodor Dieselworks is the Diesel-engines counterpart of the steam-engine Victor and Kevin Sodor Steamworks.

Percy the tank engine is next deceived by the engines, Diesel 10 means trouble trickery, getting him to fetch his friend Thomas train and taking him to the Dieselworks, where Thomas the tank engine is held captive.