Power To Model Train Sets

March 13, 2006

Most model train sets run on low voltage power. Unlike the AC electrical circuit in a house, the electricity that moves your model train locos is DC, ie. Direct Current.

The supply to a model train layout comes by plugging a power pack (also called a transformer) into a wall socket that takes the AC supply, steps it down to the 12-15 volts needed to run the model trains and up to 18 volts for the train set accessories.

The transformer converts the output to DC, filters the DC to purify it, then outputs the supply from the terminals on the back of the controller, along a couple of wires to the model train tracks where it is picked up by a locomotives wheels, turning the motor within. The throttle control varies the voltage to the rails, changing the speed of the motor and consequently the rate the locomotive moves down the train track.