Thomas & Friends (1984)

S02E21 The Diseasel

Bill and Ben, the twin engines at the China Clay Pits, are stunned to find their trucks have vanished! In their quest to figure out the mystery, they mistakenly blame a diesel named Boco for the theft, causing a series of misunderstandings. As tension rises, chaos ensues until Edward steps in to clarify the situation, revealing the true story behind the missing trucks.