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· Registered
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Most books seem to suggest using the inner rail of complete circuits as the 'common' connection and that this will usually be the 'negative'. On an end-to-end layout it probably doesn't matter much, provided you are consistant.

I belive model locos are wired to a standard so that all will move consistently one way if placed on a track facing one way and with the same polarity of voltage applied to the track. But I cannot remember (or find out!) what that convention is.

John Webb
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