N GEN 4-8-8-4 Big Boy Locomotive w/DCC & Sound UP 4024 (ATHG-2257)

Athearn Genesis 4-8-8-4 Big Boy steam locomotive with DCC and sound in Union Pacific's Greyhound livery (UP 4024) is a premium, ready-to-run model that lets rail enthusiasts faithfully recreate one of the railroad’s most memorable engines on a layout. It features an onboard DCC decoder with SoundTraxx Tsunami2 sound and operates on both DC and DCC layouts, delivering authentic locomotive noises and full digital control for a lifelike experience. The Greyhound paint scheme with yellow trim provides a striking, era-appropriate look for display and operation alike.

Designed for realism and performance, this Big Boy showcases a heavy die-cast frame for traction, individually applied piping and valves, see-through running boards and cab windows, and body-mounted scale knuckle couplers for prototypical operation. It arrives fully assembled and ready to run, with bidirectional LED lighting that maintains constant brightness and precise slow-speed control for smooth starts and stops. Compatible with standard layouts (minimum radius ~11 inches) and adjustable via NMRA CVs for customizing MU lashups and other setups.