HO 4-6-6-4 CSA-2 Challenger Locomotive with Tsunami2 DCC & Sound (ATHG-999)

HO-scale 4-6-6-4 Challenger locomotive with Tsunami2 DCC & Sound is a faithful replica of ALCO’s CSA-2 Challengers built for Union Pacific, capturing the imposing articulated silhouette on an HO layout. This model includes illuminated number boards and headlights for authentic night-time operation, and a tender-mounted DCC decoder with SoundTraxx Tsunami2 sound paired with dual cube speakers for rich, immersive audio. It supports full DCC functions as well as DC operation, delivering realistic steam-era performance whether you're running on a modern command system or a traditional controller.

Designed for HO layouts, this Challenger emphasizes smooth, dependable operation and detailed realism. Features such as pivoting front and rear engines for negotiating 18-inch radius curves, current pickup on all driving wheels, and a detailed boiler backhead with printed gauges enhance both handling and appearance. The model includes an upgraded loco-to-tender connection for durability, adjustable top cab vent and cab windows, and the option to tailor sounds and functions via CV changes. A 22-inch minimum radius ensures reliable tracking on most hobby grids.