This is the DT-4 Rolling Stock Detector from Circuitron.
Ideal for spotting a hidden train or piece of rolling stock. Four independent detection units combined onto one circuit board, can be used separately or together to control external devices. Supplied with four Opto-Sensors that mount between rails to detect movement. When train covers a sensor, the unit activates any connected DC accessory, such as an indicator light on a control panel. Independent sensitivity controls are provided for adjusting each Opto-Sensor to lighting conditions. Constructed on a 3 x 3" printed circuit board. Requires 10-18V DC. Independent of track power. Compatible with radio or carrier control systems.
The Circuitron rolling stock detector is being used to sense the rolling stock position on a elevator being used in my model railroad . One set of sensors determine if the the rolling stock is in position so that the elevator can be moved safely. Another set of sensors determine if the rolling stock is not in the correct position to move the elevator. It was necessary to add additional light to operate the sensors correctly. It be great if I knew how many sensors come with the detector. I needed more sensors then supplied. Now I will have order more sensors.
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