In Dirty Objects, James mocks Toby's shabby paint. Toby has the last laugh in the conversation.
"James," he asked, "why are you red?" "I am a splendid engine," answered James loftily, "ready for anything. You never see my paint dirty." "Oh!" said Toby innocently, "that's why you once needed bootlaces; to be ready, I suppose?" James went redder than ever and snorted off.
Duck and the Diesel Engine
The Barber telling off Duck for scaring his customer rather then crashing into the Barber Shop, then covering his face in shaving foam.
From the beginning of "Bluebells of England", Percy is singing about the bluebells, which Douglas finds it annoying.
Douglas: If ye must sing, Percy, can't ye sing in tune?!
Small Railway Engines
Mike being teased by Bert and Rex in response to comments about Duck's whistle, which is jammed by a bit of egg that his driver and fireman were cooking with his steam.
Mike: If engines can't whistle properly they shouldn't try. Bert: Then why do you? Mike: Why do I what? Bert: Try to whistle of course. Mike: Shut up! You're jealous. Mine (his whistle) is better than yours anyway. Rex: Listen Mike. If I had a whistle like yours you know what I'd do? [Beat] Rex: I'd lose it.
From "Tenders for Henry", we have this dialogue where Henry, James, and Duck assume some reasons why Gordon feels unhappy, much to his annoyance:
Gordon: I'm not happy. James: Your firebox is out of order. No wonder after all that coal you had yesterday. Gordon: Hard work brings good appetite! You wouldn't understand! Duck: I know! It's boiler ache. I warned you about that standpipe on the other railway, but you drank gallons. Gordon: It's not boiler ache, it's— Henry: Of course it is. That water's bad. It furs up your tubes. Your boiler must be full of sludge. Have a good washout, then you'll feel a different engine. Gordon: Don't be vulgar!