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DCC TWO ENGINES RUNNING OPPOSITE DIRECTIONS ON THE SAME TRACK
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<P>as mentioned, polarity has NOTHING to do with loco direction. If it did, your engines wouldnt move at all because DCC uses AC current to the track and the polarity is reversing 60 times a second I belive. The decoder is a lot like a miniature power pack that rides inside your locos. It takes the AC from the rails, makes it DC and controls the voltage and polarity to adjust speed and direction. Just like a power pack. And decoders also do neat stuff like lights and sound.</P> <P>The only time polarity is even a consideration in DCC is on a reversing loop where the polarities have to match on both sides of the gap. </P>
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