Circuitron 800-5204 DT-4 Rolling Stock Detector Hardware but all wait for a

but all wait for a train or bus

reading or merely waiting

2 One window end wall

Bridge is made of pieces that are brown and black

Circuitron 800-5204 DT-4 Rolling Stock Detector Hardware but all wait for aCircuitron 800 5204 DT 4 Rolling Stock Detector 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