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If there are two trains in the loop when it changes polarity, there will be no problem as long as all engines and all metal wheels (including all pickups on cars like lighted passenger equipment) are completely IN the reverse section when the first metal axle crosses the gaps between the reverse and normal sections. <br /> <br />Remember, DCC is not DC -- rail polarity has no meaning as far as engine direction is concerned. That's all done by the decoder. The problem is when the two rails are connected, even briefly. <br /> <br />Try searching the forums for "reverse loop" -- you'll find a whole passel of threads with all sorts of advice, diagrams, and suggestions.
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