HO SD70M Locomotive UP #3971 (ATHG-1586)

HO Scale Union Pacific SD70M Locomotive, UP 3971, is a detailed reproduction of EMD’s modern freight powerhouse. It features a heavy die-cast frame and a Genesis driveline with a 5-pole skew-wound motor for smooth, quiet operation, along with RP25-contoured wheels for compatibility with most HO track. The model includes see-through cab windows with a full interior, wire grab irons, fine-scale Celcon handrails, and a detailed fuel tank with fillers and breather pipes. Body-mounted scale knuckle couplers (Kadee compatible) and LED lighting add to the realism, while a DCC-ready design with Quick Plug and a 21-pin NEM connector makes digital setup straightforward and ensures reliable power via all-wheel electrical pickup.

Sound-equipped variants feature onboard DCC decoders with SoundTraxx Tsunami2 sound, delivering engine, horn, and bell audio that operates in both DC and DCC, with full DCC functionality when in DCC mode. The powertrain includes a 4,000 horsepower 16-710GB prime mover, AR20 alternator, D70TR traction motors, and the EM2000 microprocessor for enhanced self-diagnostics, all driving a robust, detailed model faithful to UP’s roster. Road-name specific features for UP variants include front ditch lights, a 5,000-gallon fuel tank, and a front EMD low snowplow on certain configurations, with additional options such as PTC antennas or varied radiators depending on the road number. The model is described as Primed for Grime, offering a natural starting point for weathering, and Legendary Liveries provide iconic or alternate paint schemes for collectors seeking unique roster entries. A minimum 18" radius is recommended, with 22" encouraged for best performance on curves.