Steam engine question

[Sumpter250]

The boilers, and fireboxes are significantly smaller in a traction engine, and dampers would most probably be very useful. In a locomotive, dampers would most likely be marginal at best, which is why the draft is aided/controlled by way of the stack, and exhaust nozzle. Using the exhaust steam, "automatically" adjusts the draft, and as a result, the heat of the fire. It's also rare that a locomotive will experience an unexpected sudden stop, so the fireman can anticipate the reduced need for "heat" and not feed fuel at the same fast rate.
The "teamwork" between the fireman and the engineer is one of the most essential components in an efficiently operated steam locomotive. What one does, greatly effects what the other has to do.