Circuitron
FL1 Strobe Flasher

N, Red LED
Walthers Part # 800-1022, p. 773 Walthers 2012 HO Scale Reference
N scale, $16.95, not currently in stock at Walthers, Expected: Unknown

 
Bright flash, small package, battery operation. Long battery life; six months continuous operation from one AA alkaline cell. Will operate off hearing aid or watch cell. 1/2 x 3/4" high. HO: 1.5V; O: 3V, N: 1.5V.