Thomas & Friends (1984)

S12E3 Rosie's Funfair Special

The Sodor carnival is on its way, and Rosie is eager to be the one to pull the train. However, she is assigned as the rear engine to assist Emily. Determined to help out, Rosie takes charge of the train, allowing Emily to focus on her other tasks. Unfortunately, Rosie is unaware that the couplings are failing repeatedly, leading to a series of crashes and chaos.