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A Mallet steam locomotive uses steam twice, so you really only would hear one set of engines (like a normal steam engine) when a Mallet is running at speed. At lower speeds. like less than 10 mph, the engineer could direct steam to both cylinders. However, once up to a certain speed, you'd only hear one set of cylinders working. A simple articulated, like the UP Big Boy or Challenger uses steam only once, so you hear all four cylinders exhausting.

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