QUOTE: Originally posted by nicknoyes I understand the theory of maintaining a hot fire in a steam engine while it is underway by exhausting the steam cylinders into the smoke box. The chew chew sound coming from the alternating exhausts from the left then the right cylinders. Assuming this is correct, how is the draft maintained when the engine stops temporarily? I have heard stopped locomotives make the chew chew sound even though not a wheel turns and no one is in the cab. This is obviously air pressure which is probably maintaining the fire but what turns on the air? Nick
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