Installation Instructions Route power from a 6-20 volt power supply to the Common and Input terminals on the flasher controller (if DC, use the Common terminal for the negative lead). Link the common wires from each light and attach them to the common terminal on the flasher. Connect the remaining power wire for each light to the lamp one and lamp two terminals (one in each). Three Rail DetectionThree rail detection is provided easily by using the outer rails to complete the common wire in the circuit. Two Rail DetectionActivating the flasher on a two rail layout requires the use of a detector, such as the Trak-DT. Technical Specifications Item Number 367 Instructions Grade Crossing Flasher #367 Full InstructionsGrade Crossing Flasher Application and ExamplesGrade Crossing Flasher Application using Lionel 153IR Flash Speed (typical) 0.56 Hz - 2.5 Hz (half a second to two and a half times a second) System Compatibility AC or DC Power Current Handling 2.5 Amps per output Power Input 6-20 Volts AC 6-25 Volts DC