An old coal-burning locomotive roars down the tracks, manned only by engineer Scrappy and his assistant, Oopie. They go along at a fair clip, with Scrappy maintaining the engine, but Oopie can barely get one lump of coal into the boiler at a time.When they come to a steep grade, Oopie's broken off most of the controls, and a headlong hurl over a cliff awaits.

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