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Features

• Specifically deigned for use at grade crossings, using Opto-Sensors to detect the train. Output controls flasher, gates, bells, etc.
• Full logic system duplicates prototype grade crossing action. Does nt require sensor stay covered to activate. Integrated memory keeps output "on" until last car clears the crossing. Activates whenever a train approaches from either direction, If trains stop short then backs away, until will detect that and turn output "off." Independent of train length; will detect a short train even if it falls between Opto-Sensors. Includes four Opto-Sensors. 3 x 4" printed circuit board. 10-18V AC or DC input.