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The CIRCUITRON DT-3 Single Direction Grade Crossing Detection Circuit utilizes our proven Opto- Electronic Detection and will provide accurate grade crossing action for a single locomotive or a 100-car train. There are absolutely no modifications to rolling stock necessary. The DT-3 is completely independent of the track power and is compatible with AC or DC track power as well as command control systems (DCC). It may be used for any scale. The DT-3 may be powered from any 10 - 18-volt AC or DC supply and will control any CIRCUITRON Alternating Flasher, Bell Ringer Circuit, External Relay, etc. The DT-3 is constructed on a 2”x 3” printed circuit board.