@BillYo414 posted:If the valve is operated and no one is around to hear it....
Do the injectors make a noise that could be the new feature in January?
They do make a noise. As so many other locomotives, the A's had an injector on the engineer's side and a cold water pump for the feedwater heater on the fireman's side.
I have a recording of 1218 in service in the late fifties sitting still and you can hear the injector, stoker and air pumps working.