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Digitrax BD4N DCC 4 Block Occupancy Detector   Low-cost, High-sensitivity DCC block-occupancy detection. Adjustable resistance/current detection section (DS) trip threshold. 8A capacity, suitable for all scales and track wiring configurations...

Digitrax BDL168 LocoNet Occupancy Detector - 16 Detection Sections   The BDL168 is a cost effective LocoNet Occupancy Detector for 16 detection sections.  Lets you know when detection sections of your layout are occupied. When used in...

NCE DCC BD20 Block Dectector UnitDetects DCC track current being drawn through a single track feeder. Isolated so there is no direct electrical connection to the track. Needs no external power for most operations. Can be connected to the NCE AIU01 or...