Circuitron
ML-1 Mars Light

Walthers Part # 800-1500, p. 773 Walthers 2012 HO Scale Reference
HO scale, $21.95, currently in stock at Walthers

 
Realistic simulation of the gyrating beacon seen on many locos. Utilizing a special design, high-intensity lens end dual-filament, the ML-1 can be used in most HO locos. Uses 2.4-3V DC from batteries, #800-2002 TP-2 or #800-2003 TP-3 Track Power Adapters, sold separately.