BLI 9907 HO Scale UP CSA-2 Early Challenger Union Pacific 3816 Rebuilt Engine Paragon4 Hybrid Doodlebug famed for its speed

famed for its speed

O-36 suggested minimum radius

Branches include SC&S and South Bend

for Ryefield 5001L/5050

BLI 9907 HO Scale UP CSA-2 Early Challenger Union Pacific 3816 Rebuilt Engine Paragon4 Hybrid Doodlebug famed for its speedBLI 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