Union Pacific 4-6-6-4 Challenger UP #3933 Steam Locomotive (ATH25542)

Union Pacific Challenger 4-6-6-4 steam locomotive UP 3933 is a highly detailed, ready-to-run model that faithfully captures the Union Pacific’s iconic Challenger. This coal-burning variant features a dual smokestack and tender bunker coal extensions to reproduce its wartime-era appearance from the 1940s through the 1950s, making it a striking centerpiece for any layout.

Designed for authentic operation, the model offers DCC-ready Quick Plug compatibility, a full cab interior with printed gauges, see-through running boards and cab windows, and McHenry scale knuckle couplers. A heavy die-cast frame and five-pole motor with a flywheel deliver solid traction and smooth performance, while LED lighting adds to the realism. Sound-equipped versions include a tender-mounted DCC decoder with SoundTraxx Tsunami2 sound, DC and DCC operation, and CV-based tuning for nuanced control. Pivoting front and rear engines help negotiate curves, and the model arrives fully assembled and ready to run.