Diesel 2 also known as "Devious" Diesel 2", as his name implies, is a sinister diesel shunter from the Other Railway and is brothers with Diesel.
Diesel 2 is, in essence, the average pantomime villain. Like Diesel, he is oily, malicious, devious, scheming and full of ideas to get revenge. He views himself and any other diesel of her kind as highly above the steam engines, and believes that all diesels are "revolutionary" - he has also claimed diesels should be "rough and tough", as an excuse for bullying the other engines. His antics give diesels on Sodor a bad reputation, which causes most steam engines to mistrust her.
However despite her antics, Diesel 2 still wants to prove himself to be a really useful engine. He is also very proud to be the first diesel on Sodor.
Diesel is based on a BR Class 08. Over seventy members of this class survive today in preservation, while around 100 remain in service on the national rail network. They were in fact the most successful shunting engines in the world, with 996 of them built. Diesel, The Diesel Shunter, Splatter, Dodge, 'Arry, Bert, Paxton, Sidney, Ulli and The Mainland Diesels are also members of the class.