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· Super Modulator
22,695 Posts
You buy an autoreverser.... it senses a short and reverses (swaps) the power leads.

In DCC, the motion of the locomotive is irrespective of the "polarity" of the rails, so reversing the leads to any set of rails has no effect on the direction.

One of the best autoreversers is about $45. You have a separate "block" and feed the power to that block from the output of the autoreverser.

Regards, Greg
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