The Infrared Train Detector with Relay (ITD-R) uses an Infrared (IR) sensor to detect trains on your layout.
They are ideal for giving the operator a visual indication when a train has reached a certain location on your layout that is obscured from view, or to automatically stop a train when it has reached the end of the track in a hidden yard.
When a train passes over the sensor an infrared beam is reflected off the bottom of your train causing the LED to be turned on and the relay to be activated. This relay can be used to interface with other electronic devices.
There is no tracks to cut or modifications to rolling stock, simply mount the detector at the required location underneath your track.
The ITD-R is not designed to stop trains operated by DCC.