HO GEN SD90MAC Locomotive UP #3727 (ATHG-1916)

HO Genesis EMD SD90MAC Locomotive, Union Pacific UP 3727, is a detailed HO-scale model from the Athearn Genesis line designed to deliver a faithful, ready-to-run replica of a modern freight locomotive. Fully assembled and ready to run, this UP 3727 variant brings authentic proportions and scale detailing to any layout.

Designed for reliable operation on HO layouts, the SD90MAC features a heavy die-cast frame for traction, Genesis driveline with a 5-pole motor, and all-wheel drive with solid electrical pickup for smooth, quiet performance. It rides on RP25-contoured wheels for HO track compatibility, uses body-mounted McHenry knuckle couplers, and includes LED lighting, a full cab interior, and etched see-through steps for lifelike detail. The model is DCC-ready with Quick Plug 21-pin NEM connectivity, and many versions offer onboard Tsunami2 sound with dual speakers for authentic locomotive audio. Road-number and livery variations cover UP and other railroads, with nose-door options and ditch lights, while an 18-inch minimum radius (22 inches recommended) keeps curves on typical layouts smooth and realistic.