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If you are using DCC the rest of the railroad does not reverse polarity. Only the isolated reversing track changes polarity, but unlike DC the locomotive keeps going in the same direction (controlled by its decoder, not track polarity). <br /> <br />The DC method requires a polarity change on the block that the locomotive will be entering AFTER leaving the isolated reversing track. This could be the entire railroad, but if broken up into several blocks only the following block need be reversed, and of course successive blocks as the loco reaches them. Other locos on other blocks will not be reversed.
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