- "You'll be laughing on the other side of your boilers soon, silly steamies."
- — Diesel 10, Misty Island Rescue, hinting his return in Day of the Diesels
- Class: BR Class 42 "Warship"
- Designer: British Railways
- Builder: BR Swindon Works
- Built: 1959
- Configuration: Bo-Bo
- Top speed: 90 mph
Diesel 10 is an evil diesel with a roof-top, hydraulic claw, which he calls "Pinchy".