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This is a listing for a ZAR HO scale 2 aspect signal with ladder and control board.
Theory of operation is as follows:
Signal is RED. When the train crosses the first sensor, the signal will turn to GREEN. When the train passes the signal, the signal will turn to RED again.
This makes for total autonomous operation of the signal.
Works from 9 to 12 Volts DC/AC.
Price is for one. I have 9.