HO 4-6-6-4 Challenger Union Pacific #3967 Model (ATHG97973)

HO-scale Union Pacific 4-6-6-4 Challenger locomotive, Union Pacific number 3967. This road-number-specific model recreates the WWII-era Challenger built to haul fast freights across UP’s Wyoming Division, capturing the coal-burner, dual-smokestack look and the smoke lifters that defined the class in the 1940s and 1950s.

On the layout it offers authentic UP detailing and dependable operation, including illuminated number boards and headlights, a tender light, and a richly modeled cab backhead. It uses current pickup on all driving wheels and features pivoting front and rear engines to negotiate curves, with a minimum recommended radius of 22 inches (18-inch curves are possible with the pivoting design). For fans of sound, sound-enabled versions pair a Tsunami2 decoder with dual cube speakers for synchronized chuff, whistle and bell effects, operable in both DC and DCC modes, and NMRA-compatible with CV control (CV chart included). New features add a flicker firebox with see-through door, a brighter LED headlight, and an upgraded loco-to-tender connection for greater durability and easier servicing, delivering a convincing centerpiece for any HO layout.