Railcar Motion Sensor operates on 110 VAC and senses a railcar or other large metallic moving object at a range of up to 5000 feet. The sensing device is buried alongside the track in dirt or concrete. When a car or locomotive passes the sensor, the light and horn give warning. It is ideal for protecting bumping posts, plant entrances and loading facilities. It is unaffected by weather or debris. Aldon Co. 3410 Sunset Ave. Waukegan, IL, 60087