Mike's Whistle
S20, E19: When Duck's driver boils an egg in his whistle it leaves Duck making a very funny sound. The other engines think it is very funny, but Mike insists that an engine that can't whistle is not a proper engine.
S20, E19: When Duck's driver boils an egg in his whistle it leaves Duck making a very funny sound. The other engines think it is very funny, but Mike insists that an engine that can't whistle is not a proper engine.