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John, When you use DCC the track is powered by constant voltage supplies. The DCC controler sends a digital signal through the track. Each engine picks up the signal and decodes it. If the message is meant for that particular engine, the engine executes the command (slow down/speed up/turn on sound/...) otherwise it ignores the command. You may want to hook up your stuff using a single block for the whole layout right now (assuming it is small enough). You will be able to run one cab with two-rail DC control for now. Then you can do some more research on DCC. Good Luck. - Ed
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