From the Postwar-inspired styling of the controller, to the mighty PowerHouse power supply that provides a circuit breaker and on/off switch, this transformer has all the power you need, plus electronic overcurrent protection to help save your sensitive electronics in the event of a short circuit. Two outputs are available on the rear of the unit. A 0-18 volt variable AC output serves as you main track power source. The other programmable AC output is perfect for accessory operation from the same transformer. On the accessory output, simply set the accessory voltage to your desired level for continuous operation until you turn the unit off, completely independent of the train's operation.