Bill Or Ben?

S17, E15: Connor is a new engine to the island of Sodor so when Bill and Ben see him for the first time they decide to play a trick on him and pretend to be able to go faster than him. But it’s really Bill at one end of the race and Ben at the other. When Connor tries to race them again he nearly has an accident. The Fat Controller is cross and sends Bill to be repainted so that he and Ben don’t look the same and can’t play tricks anymore but Bill and Ben still have one last trick up their funnels!