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Gluefinger, what DCC system do you have ? You should be able to use an auto-reversing unit that senses the short at a reverse section an automatically swaps polarity. I have a Digitrax system and use an additional booster set up to do this at my turntable bridge. Turntable bridges, wyes and revers loops all need to be isolated and power feeds to them routed through a DPDT or one of the auto-reverse units.
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