I am using MTH crossing signals (flashers only) on my 3 rail layout's grade crossing.  I want to use optical detection for its operation, not outside rail current detection.  Will any of the Circuitron detection boards work for me, or are they only for 2 rail systems? 

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To add to what Dave said . I used the AZATRAX D2T-DS. You get 2 pairs of I.R. sensors that can reach over 2 tracks, and sense trains in either direction.

Economical and works like a charm, not to mention "easy peasy" for an electronics novice like myself.

John Parsons from Azatrax is very responsive to emails should you have any questions .

You can just barely make out one pair of sensors at the end of my video:


" No matter how far we travel, the memories will follow in the baggage car."

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