Power Control Theory for Model Railroads

The traditional (analog) DC used track blocks and selector switches to control only one loco at a time, as shown in the diagram below.

Digital Command Control

DCC simply moves some of the control functions from the power pack into the locomotive. This allows two or more locos to sit on the same powered track, but only one responds to the commands sent to it.

Once your track is wired, each loco is equipped with a "decoder" that only recognized its designated "address" and converts the packets of information sent to that address into commands that activate motors, lights, bells, whistles, etc.

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