Thomas & Friends S04E03 - Bulldog

Based on the story of the same name from Duke the Lost Engine.

Falcon is sent to take the Mountain Road with Duke. However, he is impatient and does not pay attention to Duke's advice. He winds up dangling from a cliff. There are more problems, as Duke is out of water. Despite this, he clings on to Falcon like a Bulldog and manages to build up enough steam to save him.