Thomas & Friends (1984)

S18E22 Timothy & The Rainbow Truck

Bill and Ben pull a fast one on Timothy by convincing him to embark on a quest across the island for a vibrant truck. However, once the oil-burning engine discovers the ruse, Salty steps in to assist him in devising a clever plan to turn the twins' prank against them. This episode is also referred to as "Timothy and the Colorful Car."