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Track buses for Digital Command Control

Fig1
Layouts wired for direct-current block control have several isolated track sections called blocks. Each block has an electrical switch that controls which DC throttle powers that track section. In theory, a Digital Command Control (DCC) layout could be wired as one large block with two wires feeding the power directly from the DCC booster to the track. However, on any model railroad larger than a test track, more wiring is necessary if you want your trains to run well.

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