BLI 9917 HO Scale UP CSA-2 Early Challenger Union Pacific 3915 Builders Fantasy Scheme Paragon4 Hybrid Era_1940-1960s Get yours today and get

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BLI 9917 HO Scale UP CSA-2 Early Challenger Union Pacific 3915 Builders Fantasy Scheme Paragon4 Hybrid Era_1940-1960s Get yours today and getBLI 9917 HO Scale UP CSA 2 Early Challenger Union Pacific 3915 Builders Fantasy Scheme 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