Diesel 11 is a big diesel engine who is Diesel 10's brother and Diesel 100's father and is an evil diesel engine with a semi-sentient roof-top, hydraulic claw, which he has named "Pinchy Junior".
Diesel 11 is based on a BR Class 42 diesel-hydraulic with an added non-regulation hydraulic claw. All but two members of the class were named after Royal Navy nothing warships, so they, and the similar Class 43, were nicknamed "Warships". Two of these engines are preserved.
Diesel 11 is painted ochre with tan stripes along his sides. His buffers and "Pinchy Junior" are painted silver.