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![800-5201 DT-1 Grade Crossing Detector - MPM Hobbies](http://mpmhobbies.com/cdn/shop/files/800-5201-dt-1-grade-crossing-detector-mpm-hobbies_436x436.png?v=1705821413)
The CIRCUITRON DT-1 is a bi-directional detection circuit designed for DC track power that provides an output whenever one of its Opto-Sensors is covered by a piece of rolling stock. Absolutely no modifications to the rolling stock are necessary.