The one I saw in the 70s was a squeaky contraption.
I see why now. In one photo you can see the pulley rubbing a bare spot in the bracket.
Its building was torn, or was crushed on the backside, but still awesome to watch the cars. It immediately reminded me of the Jetsons cartoon. I consider it, and the disappearing train to be the two best dealer layouts I've seen.
Ritchie, Since your not likely going for an exact "historical" recreation, a garage sale can-opener may supply a motor with a speed you can live with, and torque enough to do this at a low price. I'll offer to send the one I just took apart, but I bet you can find one local cheaper than shipping alone .
Is there an organized check list of known dealer layouts someone has, to accompany this thread? I don't see it being a short one