HO 4-6-6-4 Union Pacific #3997 with DCC and Sound (ATHG98975)

An HO-scale Union Pacific 4-6-6-4 Challenger with DCC and sound, this locomotive brings mid-century mainline power to life on HO layouts. It reproduces the Challenger’s distinctive four-axle leading truck, two sets of driving wheels, and four trailing wheels, delivering a faithful sense of Union Pacific’s wartime mainline workhorse. The coal-burner variant features dual smokestacks and tender bunker coal extensions, representing the 1940s through the 1950s era.

Inside, a tender-mounted DCC decoder with SoundTraxx Tsunami2 sound delivers authentic engine, whistle, bell and related effects that run in both DC and DCC modes, with full DCC functionality when configured. Dual cube speakers provide robust, immersive sound, while lighting includes illuminated number boards and headlights, a tender back-up light, and a flickering firebox for added realism. Pivoting front and rear engines aid curve negotiation on HO layouts, with current pickup from all driving wheels for steady pulling power and a durable loco-to-tender harness for long-term reliability. Road-number-specific features for this UP Challenger include coal-burner configuration, dual smokestacks, and tender bunker coal extensions, reflecting the era from the 1940s through 1959.