On my new dash 8 I have two rollers. Yes it seems that the curve 72/54 are causing the most trouble. but most of them do act up. when I try to run my dash. So far my NH ABA has not had the same problem. I'm powering the switches separate from track power. All told I have 23 switches on a 10 x 20 layout, two levels, using a math 4000 for track and a prewar train master for switches. I also seem to having up and down power issues, although I have 20 v going through the track. Guess I will figure it out one short step at a time.
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