Complete, simple detection with timed three-color block signal animation. Signal turns red as train passes. After last car clears signals, adjustable time delay starts (up to 30 seconds). After time delay, signal then turns yellow. After another adjustable time delay, the signal goes back to green. For 2-rail DC or 3-rail AC track power in all scales.
 
For 3-rail AC track power. Uses isolated section of outside rail of detection. No Opto-Sensors, adjustments or light limitations.