Chuggington (2008)

Season 1: Episode 25

Wilson has been given the important job of bringing the refrigerated ice cream cars from the ice cream factory to the Ice Cream Tasting Fair. The refrigeration cars are heavy, so he'll have to take them one at a time. Wilson makes the first trip successfully, but when his hero - cool ice cream chugger Frostini - offers to give him a tour of the factory, he forgets all about his important job.