No More Mr. Nice Engine

No More Mr Nice Engine is a seventeenth season episode.

Plot
Hiro is one of the strongest engines on Sodor, and he is also very polite and gentle. Diesel tells Hiro that the only way to get the trucks to do what you want is to give them a biff and a bash, but Hiro is not convinced.

Characters

 * Hiro
 * Diesel

Source

 * ABC TV Guide