You may want to contact Dallee.
The display I put up was a long track with reversing loop at each end. A sign with "Start the Train" printed on it and an arrow pointing to a button. Someone pushed the button and the train ran for five minutes. It always stopped at the same place on the track. The Dallee unit made a gradual start and stop, which was really nice - no slam bam jackrabbit starts. Ran everything from prewar to proto2 on it with no problems.