The Instant Response Detector reacts to train arrivals and departures by immediately changing its outputs. This is the Detector for fast acting electronics that expect and can handle brief changes in detection, such as between railcars.
The NightScope™ Infrared Detector reliably senses trains in all lighting conditions. Just 3 inches long and less than 3/8 inches in diameter, the Detector mounts below your track with two small holes in the ballast between the rails. When a train is present, the Detector activates its two opposite-polarity outputs, “Detect High” and “Detect Low”. These outputs are designed to drive a wide variety of popular model railroad electronics.