N GEN 4-8-8-4 Big Boy Locomotive w/DCC & Sound, Primed For Grime UP #4003 (ATHG-2254)

ATHEARN Genesis 4-8-8-4 Big Boy steam locomotive with DCC and sound, Primed For Grime finish in Union Pacific UP #4003, is a detailed, ready-to-run HO-scale model of one of railroading’s most iconic giants. Designed to reproduce the Big Boy’s massive 4-8-8-4 configuration and distinctive silhouette, it captures the locomotive’s imposing presence with a weathered, in-service look that fits historical or proto-freelance layouts.

Primed For Grime finish provides an authentic starting point for weathering, with faded base colors and road-number cues such as #4003’s coal burner and cooling pipes. Inside, a DCC decoder with SoundTraxx Tsunami2 delivers realistic sound and full DCC control, while the model runs on DC as well. A heavy die-cast frame, 5-pole motor, and precision detailing deliver traction and realism, complemented by see-through running boards and cab windows, body-mounted McHenry knuckle couplers, and directional LED headlights. Fully assembled and ready to run, it’s designed for smooth operation on layouts with an 11" minimum radius and supports MU lashups and CV customization for a personalized roster.