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
PAs on the Pony Express
By Angela Cotey | October 19, 2020
| Last updated on January 6, 2021
