I tried the bottom approach, but had to be closer than the axles to get a response. I think that might be because they were black. It also seemed like I had to be closer to metal than plastic. Stan or Brendan, can these sensors be paralleled so you could have a distance between them to make up for the gap between cars? I have trains running both directions all the time, so I would have one at each end of the block for signals. I'm enjoying this and all the help is making it possible.
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