>> They do not "chuff" either.
They do, because Google told me, so it must be true.
Q. Why does a steam train chuff?
A. Steam is exhausted through a nozzle and up through the smokebox into the stack. This action produces the “chuff chuff” sound heard when the locomotive is moving.
Q. What is a train chuff?
A. Because steam alternately acts on both sides of the piston during each cycle, there are two exhaust beats, or "chuffs", per cylinder.
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