Reply to "Erratic smoke and chuff sounds on Lionmaster PRR T-1 Duplex"

I opened it up again and the cam is not loose.  When I put it back together and tried it for the first time, chugging and smoke began but within seconds smoke and chugging stopped and the engine continued running with constant steam sounds.   Might there be a problem in the motor driver board, 691dcdsje101428 into which the wire from the cherry switch is plugged in?  I will mention something else that may be related.  The smoking whistle including both fan and smoke output, on this engine simply does not work from time to time, but most of the time is ok.  Everything else works, bell whistle, talking, etc.