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Re-install your AR-1 and double-triple check your wiring. Then start by checking across a set of rails on the same piece of track.  Test the rails on the turnouts.  make sure you dont have a short between top and bottom rail of each track.  check all possible paths, note where shorts occur and the positions of turnouts when the shorts occur.  If there are no shorts with track power off, you are looking of something with the locomotives shorting across adjacent rails (wide wheel tread will do it on PECO turnouts).  Some diesels have metal side frame trucks that overhang just enough to cause a short.  With track power off, place your locomotive at the exact point the short occurs and note everything the wheels touch.  Lightly push the locomotive to one side or the other (side to side on the track), check that wheel treads are not touching opposite polarity rail.  Check frogs of turnouts dead (no continuity with anything), on those turnouts that have metal frogs (if any).
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