Simple Shuttle Automatically cycles a train from one end of the line to the other. Stop-time is adjustable from 10 to 100 seconds. For a single train, place Simple Shuttle at one end and a Standard IRDOT-1 at the other. To cycle up to 6 different trains on stub tracks, us the Simple Shuttle with an IRDOT-P on each stub to automatically throw the switches. Requires 12vDC power supply. Use your own power pack to power the train. Maximum current draw for each train: 3 amps.