
An Alco PA/PB/PB consist leads the Union Pacific’s Pony Express across the desert near Victorville, Calif., in the early 1950s. The railroad’s 14 PAs and PBs were assigned to passenger service in the West.
Donald Sims photo
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| Last updated on August 8, 2025
An Alco PA/PB/PB consist leads the Union Pacific’s Pony Express across the desert near Victorville, Calif., in the early 1950s. The railroad’s 14 PAs and PBs were assigned to passenger service in the West.
Donald Sims photo
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