SENSA-TRAK II INFRA RED AUTOMATIC TRAIN DETECTION CIRCUIT BOARD COMPLETE Price is for ONE unit Infrared train positioning device useful in showing the exact position of a train in hidden staging yard, tunnels, and hidden siding. Turns on a red LED to show the section is occupied. Sensa-Trak II™ is also used for triggering automatic reversing circuits, triggering flashing grade crossing, and controlling aspect signals. Mounts below track, with sensor between rails. Comes with full instructions. UNIT FITS UNDER YOUR BASEBOARD AND TRACK INSTALLATION REQUIRES YOU TO DRILL ONE 3/8" HOLE BETWEEN THE RAILS OF YOUR TRACK BED. THE UNIT IS FITTED UNDER YOUR BASE BOARD AND THE SENSORS PROTRUDE THROUGH THE HOLE SO THAT THE INFRA RED BEAM CAN DETECT TRAIN MOVEMENT CONNECTING THIS UNIT TO RED AND GREEN led's (NOT SUPPLIED) AND FITTING THEM ON YOUR TRACK CONTROL DISPLAY BOARDWILL GIVE YOU VISUAL TRAIN DETECTION, IDEAL IF YOU HAVE SIDEINGS OR HOLDING LOOPS IN HIDDEN AREAS
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