|Occupation: Diesel shunter|
|First Appearance: Duck and the Diesel Engine|
|Performer: Tim Curry|
Diesel is a devious Class 08 shunting diesel.
Diesel believes that Steamies are no match for Diesels. Oily, scheming and ever ready to stir up trouble in the shed, Diesel's characteristic smirk is a sure sign that some Steamie, somewhere is in for a bit of trouble.