Actually the BD-20 of NCE can detect what ever current is draw by the hot (middle) or the common (outside rail ) without insulation of the rail. But it work only with engines, caboose or cars with lights, with DCC, you can make it detect cars if you install a resistor on the axes between the wheels. That's a no go for me, I need it to detect the cars too; if the train crew cut a train and live few cars on the track when he is switching on a siding, the main is not clear.
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