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I am working on this very issue as well. From all of my research (I am using Digitrax,) either I have to use the DCC Block Occupancy dectectors (Digitrax makes one for their system,) or optical. The other method is to use optical block occupancy detection. I am going to begin experimenting with this and just received my Circuitron DT4 Rolling Stock Detectors (4 sensors per board, $35.00 per board.) The most advanced stuff is transponding. I don't know if this works with other DCC systems, and again the same block occupancy detectors from Digitrax must be between the isolated block and the dcc main feed. It then uses Loco Net to report back to the system on occupancy by voltage draw, or can be combined with special transponding sensors that will report more precise info on the transponding decoders in the block. My problem is all of the voltage based occupancy detectors require voltage draw. While that is ok for locos, I like long consists and do not want to modify each car. Hence, I am trying the optical stuff soon. Good luck.
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