S1·E25 Off the Rails

One day, Gordon is dozing in a siding when Henry comes by, waking him up with a loud whistle or two! Gordon tells Henry, "Mind you keep on the rails today," in regard to his previous incident with the Flying Kipper. Not long afterwards, Gordon feels most annoyed when he is asked to pull a goods train. So whilst on the turntable, he tries a bit of sabotage - which doesn't go according to plan...