HO SD70M Locomotive with DCC & Sound, UP #3971 (ATHG-1607)

This HO-scale SD70M locomotive with DCC and sound in Union Pacific livery UP 3971 is a detailed model built for realistic operation on HO layouts. It combines a heavy die-cast frame and all-wheel-drive with a Genesis-style drivetrain and a 5-pole skew-wound motor for solid pulling power, while RP25-wheeled trucks provide smooth tracking on standard tracks. The on-board DCC decoder with SoundTrax Tsunami2 sound runs on both DC and DCC layouts, delivering authentic engine, horn, and bell sounds with full DCC functionality in DCC mode. Realistic details include see-through cab windows with a full interior, body-mounted scale knuckle couplers (Kadee-compatible), fine Celcon handrails, windshield wipers, and a detailed fuel tank with gauges. LED lighting, a 21-pin NM Quick Plug interface, and robust electrical pickup enhance reliability, and the model is designed for 18" minimum curves (22" recommended) to maintain smooth operation on a wide range of layouts.

For UP 3971, road-name specific features include front pilot mounted ditch lights, a 5,000-gallon fuel tank, and a front EMD low snowplow. The SD70M family also encompasses other road-name variants with different radiator layouts, antennas, and horn options to mirror prototype differences. Legendary Liveries offer a curated set of iconic paint schemes, while Primed for Grime variants provide an ideal starting point for weathering toward an “In Service” appearance. The included CV chart lets enthusiasts tailor speed control, lighting, and sound, supporting detailed multi-unit lashups and personalized operation on their layout.