Better than most railroads, perhaps, the Union Pacific understood fast freight service. With an expansive network of lines spread across the western states, the railroad had to maintain fast schedules in order to remain competitive. Mindful of this, UP purchased the first heavy fast freight locomotives: unique three-cylinder 4-12-2s, built by Alco from 1926 to […]
Steam locomotive profile: 4-6-6-4 Challenger
