I would like to know if it is possible to use The Electric Railroad Company's Mini ACC Commander to trip the sound board in the Polar Express Announcement Car? I presume the car uses constant AC Power to power the board but then uses the pulse DC from the horn button to trigger the announcement. I would run this car in TMCC mode, so 18 volts AC is always present. I would assign the ID of this car as an Accessory. I would be buying the board and speaker through Lionel and actually installing it in a Polar Express Baggage Car. (I understand, that I will need to add power pick-ups to the trucks) Before I embark on this modification, I want to know if this is feasible?
Or am I mistaken, and this board only need a DC input to operate the announcement (no additional power requirements)....so all I'd need to do is have a switched DC voltage applied to it?
Remember, polarity matters, the outside track connection is positive for the bell button, so that's what would trigger the announcement. 
