|Color: Mustard Yellow with Cream Stripes|
|Occupation: Leader of the Diesels|
|First Appearance: Thomas and the Magic Railroad|
|Performer: Matt Wilkinson (UK/US)|
Diesel 10 is an evil diesel engine with a semi-sentient roof-top, hydraulic claw, which he has named "Pinchy".
Diesel 10 is a renegade engine who is 10 out of 10 for brutal strength and devious deeds, and out to destroy the harmony of Sodor.