Bulldog

"Fusspot, fusspot. Fuddy-duddy, fuddy-duddy, fuddy-duddy!"
Percy is itching to show off his new paint to the passengers, but it is too early and to make a point, Thomas tells him and the other engines a tale about Duke.
At the time the story took place, Falcon was still new to the Mid Sodor Railway and so was to double-head a train along the Mountain Road with Duke. Falcon was cross and insisted on going in front, but he paid too much attention to the view and not enough to the rails and thus derailed, hanging dangerously over the edge of a cliff. Duke gallantly held Falcon until his steam pressure was good, then he pulled Falcon back onto the rails. Falcon was grateful but perplexed at Duke's braveness, having insulted him previously. Duke modestly claimed he did not want Falcon's new paint to be spoilt.