{"product_id":"dt-1-grade-crossing-detection-unit","title":"DT-1 Grade Crossing Detection Unit","description":"Specifically deigned for use at grade crossings, using Opto-Sensors to detect the train. Output controls flasher, gates, bells, etc. \u003cbr\u003e \u003cbr\u003eDetects train when an Opto-Sensor is covered. Senses track polarity and activates only the Opto-Sensors for the direction of travel. Always turns off after the last piece of rolling stock clears the crossing. Includes four Opto-Sensors. Requires an Alternating Flasher Unit to operate flashing lamps. Note: DT-1 cannot detect a short train or loco if it falls between Opto-Sensors. Use in any scale with DC track power. 2 x 3\" printed circuit board. 10-18V AC or DC input.","brand":"Circuitron","offers":[{"title":"Default Title","offer_id":53179134247277,"sku":"800-5201","price":44.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0929\/7228\/6317\/files\/800-5201_01_a622fed0-3ddd-47da-829c-1190e2910384.gif?v=1774984168","url":"https:\/\/walthers.com\/products\/dt-1-grade-crossing-detection-unit","provider":"Walthers","version":"1.0","type":"link"}