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I think the original poster meant switching the loco direction, not the points of the turnout. Whether you make the turnout one way or not, you do have to do something when you come out of the loop, since the track polarity must be reversed. You need a box that senses the short circuit when your loco straddles the two different polarities when emerging from the reversing loop. In DCC, you would get a booster that auto-reverses when it senses a short. By the way, DCC is not that expensive. When you start doing reversing loops, and separate the main line to separate blocks, all the extra electrical equipment starts to mount up. DCC is much easier to wire. If you have only one loco at a time on the track, then DC with the associated electronics is cheaper. To solve your problem in the most inexpensive way, you need to isolate the loop power from the main line. You also need to be able to reverse the main line polarity independently of the loop. If you always enter the loop from the same direction, then you might be able to save one DPDT switch, but why? Set the loop polarity so that it matches the main line. Once you are in the loop, reverse the polarity on the main line, and when the train exits, it will keep running forward, rather than short out. Regards, Greg
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