HO GEN 4-8-8-4 Big Boy Locomotive with DCC and Sound Primed for Grime UP #4003 (ATHG-2204)

HO-scale Genesis 4-8-8-4 Big Boy steam locomotive with DCC and SoundTraxx Tsunami2 sound, built to bring Union Pacific’s iconic 4-8-8-4 to your model railroad. Road number 4003 is finished in Primed for Grime to represent an in-service look, with features like a coal burner and cooling pipes, providing an ideal starting point for adding weathering that reflects daily operation.

Inside, the model houses an on-board DCC decoder with Tsunami2 sound and dual speakers for rich, era-appropriate audio that works in both DC and DCC, with full DCC functions available. Highlights include illuminated number boards and headlights (headlight turns off in reverse) plus a tender back-up light, detailed boiler backhead with printed gauges, and configurable cab vents. Pivoting front and rear engines enable smooth negotiation of HO 22-inch radius curves, and current pickup on all wheels keeps operation steady. The Primed for Grime finish makes it a perfect canvas for weathering, offering a realistic in-service appearance that you can customize to match your layout’s era and scene.