Wherever there is a need for an automatic reverse system between two points for a display, test track, sidetrack for trolleys or other types of cars. This unit will create added interest for your train layout! Sensing devices included with each unit. Also included are heat shrink tubing and a FREE transformer to operate the unit (WT512). Special wood screws are included. This is truly what is meant by a value added package. The unit is good for all scales including trolleys. The unit is rated at 3 Amps. Note: OPERATES ONLY ON 12 VOLT DC POWER.