Chuggington (2008)

Season 1: Episode 31

The trainees are trying their wheels at pulling rolling stock around an obstacle course. Ambitious Wilson tries the fire wagon. The course seems easy - until Dunbar tells them they have to do it backwards! Wilson goes first, but makes loads of mistakes. Discouraged, he slopes off and bumps into Harrison, who gives him a tip: he should drop down a gear for more control. Great!