Train Proximity Sensor

[Gary Allen]

Looking for a train proximity sensor that would provide DCC AC voltage as the train passes by, else open circuit.  I could use it to activate train signal lights.  It would be nice if it would fit under the Bachmann HO scale track and get power from the track rails.  I would like it to be as inconspicuous as possible.  My train layout is atop the dining room table so I cannot drill holes into the surface.

[jward]

https://www.digitrax.com/products/detection-signaling/bd4n/

[rhwalker]

Z-Stuff has exactly what you need and I have used their devices extensively.