Circuitron
ML-2 Mars Light

Walthers Part # 800-1502, p. 773 Walthers 2012 HO Scale Reference
A scale, $23.95, not currently in stock at Walthers, Expected: Unknown

 
Alternately flashes two 1.7mm diameter, high intensity lens-end lamps (included) at a prototypical speed. Lamps may be mounted in dual headlight housings or side-by-side in larger headlight openings. Requires 2.4-3V DC input which can be provided by batteries, #800-2002 TP-2 or #800-2003 TP-3 Track Power Adapters.