800-5502 BD-2 Block Occupancy Detector Current Sensing O-16.5-Scale a locomotive

a locomotive

entering or leaving an office building

completed layout needs no plywood base or additional structural support

This kit stands out for its high level of detail

And wherever track goes

800-5502 BD-2 Block Occupancy Detector Current Sensing O-16.5-Scale a locomotiveBD 2 Block Occupancy Detector Current Sensing Details: The CIRCUITRON BD 2 is a highly sensitive integrated circuit block occupancy detector designed for reliable operation across virtually all model railway scales and track power systems, including most forms of command control. It detects the presence of locomotives and lighted rolling stock by monitoring current draw through the rails, providing accurate and responsive block occupancy indication.