BLI 9907 HO Scale UP CSA-2 Early Challenger Union Pacific 3816 Rebuilt Engine Paragon4 Hybrid Doodlebug Proper underbody detail per the

Proper underbody detail per the prototype with warning label placements

AK11003 - White Grey

1x Vengorian Lord (which can alternatively be built as 1x Lauka Vai

O-36 suggested minimum radius

BLI 9907 HO Scale UP CSA-2 Early Challenger Union Pacific 3816 Rebuilt Engine Paragon4 Hybrid Doodlebug Proper underbody detail per theBLI 9907 HO Scale UP CSA 2 Early Challenger Union Pacific 3816 Rebuilt Engine Paragon4 Hybrid The Union Pacific Challengers were a class of powerful, simple articulated 4 6 6 4 steam locomotives built by the American Locomotive Company (ALCO) exclusively for the Union Pacific Railroad. Between 1936 and 1943, a total of 105 were constructed. Measuring an impressive 122 feet (37 m) in length and weighing 628,000 pounds (284,800 kg), these locomotives