UP Class CSA-2 Post-1947 Early 4-6-6-4 Challenger - Sound & DCC - Paragon4 -- Union Pacific #3831 (Fantasy 2-Tone Gray)

This Broadway Limited HO Scale UP Class Post-1947 CSA-2 Early 4-6-6-4 Challenger Brass Hybrid steam locomotive is based on the huge articulated mallets used by Union Pacific to move tonnage across its mainline over Sherman Hill from Ogden to Wasatch, Utah as well as on tough grades systemwide. The Union Pacific Challengers were simple articulated 4-6-6-4 steam locomotives built by American Locomotive Company for the UP. 105 of these locomotives were built between 1936 and 1943. The Challengers were 122' (37m) long, weighed 284,800 kg, and operated over most of the Union Pacific system, primarily in freight service. The excellent Challenger design allowed for increased speed on mountain grades compared to UP's previous articulated steam locomotives. This BLI model is of the Class CSA-2 Challenger, commonly called an "early challenger". This models has a post-1947 appearance, after the locomotives were renumbered from 3900 to 3800 series and has three appropriate detail variations: four road numbers with the as-delivered front engine, four road numbers with a rebuilt front engine, and two road numbers with an integral cast cylinder front engine. All are oil-burners with 19,000 gallon cylindrical tenders. This Challenger features full Paragon4 sound and DCC for realistic sound and motor control complete with back EMF for smooth slow speeds. The Paragon4 sound system works with all Broadway Limited Rolling Thunder(TM) advanced sound systems. Other features include a heavy die cast body and chassis; smooth-running drive, applied details; directional warm white LED lighting and magnetic knuckle couplers. The Challenger can be operated on all DCC systems as well as on standard DC railroads (with limited sound functionality). This model has wheels profiled to operate on Code 70 and larger rail and curves of 18" radius or larger are recommended. The UP Class Post-1947 CSA-2 Early 4-6-6-4 Challenger is one of many Broadway Limited HO Scale Paragon4 locomotives.