HO 4-6-6-4 CSA-1 Challenger Locomotive with Tsunami2 DCC & Sound (ATHG-1012)

HO Scale CSA-1 Challenger Locomotive with Tsunami2 DCC & Sound recreates ALCO’s legendary 4-6-6-4 Challenger for HO model railroading, bringing the Union Pacific’s 1930s era powerhouse to life with a detailed silhouette, satin finish, and authentic boiler and tender detailing. The model includes a tender-mounted DCC decoder and SoundTrax Tsunami2 sound, delivering realistic chuffs, whistles, bells, and other locomotive effects in both DC and DCC operation, with a Union Pacific No. 3907 variant offered for road-number specific display.

On the rails, the locomotive features illuminated number boards and headlights, a tender back-up light, and pivoting front and rear engines to negotiate 18" radius curves. Dual cube speakers ensure robust, clear sound, while numerous individually applied details—from piping and valves to steps and air pumps—enhance realism. A durable loco-to-tender connection harness supports reliable operation, and CV-based tuning allows MU lashups and fine‑tuning of sound and performance on layouts with a minimum recommended radius of 22 inches.