Actually, the TMCC board will provide it half-wave track power, and it works fine that way. The same smoke unit is in the K-Line Porter, and I upgraded that and wired it's smoke unit directly to the smoke output of the MC-II board.
For the Plymouth, I'm seriously tempted to replace the smoke unit with the MTH HO smoke unit and try to fit the MC-II in the body and sound in the cab.
GRJ, Good to know about the half wave. Thanks. However, I think the bd. I used was feature set for a blinking strobe as it came from a Trackmobile. I can't remember if it had an extra output to do smoke or not. Good luck on your plan!