Block Signalling DAP1A Semaphore Signal Controller (signal not included) This signal controller is designed to detect the presence of trains, and operate a semaphore signal in response. The module detects the presence of trains by bouncing invisible Infra-Red (IR) light off the underside of the rolling stock, and detecting the light reflected back. When a train is detected, the module runs a built-in program which operates the attached semaphore signal. Triggered an infra-red sensor located below the track bed When a train is detected passing above, the module automatically switches the signal to Clear When a delay (adjustable) has expired, the signal is automatically returned to Danger Quick and easy to set-up Requires a 12V DC Power Supply
