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Thanks for the reply. The circuit listed in the link uses a relay. So running through a photo cell circuit should throw the tortoise. I'm not sure how to get it to throw the other way when it trips the next photo cell. The loco will enter the 1st loop, cross the photo cell and through the turnout, witch will switch the polaritly of the main. Now when the loco get to the 2nd loop it will hit another photo cell. This time I need the turnouts to throw the other way. Any ideas? Thanks
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