The ILS-3600-CAT-IR Medium Intensity Catenary Dual Lighting System provides day time and night time marking of catenary support structures. ILS-3600 systems utilize LED technology and precision optics to provide a low power, low light pollution, dual tower lighting solution. All electronics is accessible at ground level reducing the need for costly tower climbs. The flash head contains only LEDs and a multi-stage surge suppression network. System modularity facilitates maintenance and long term reliability.