One of the giants of American railroading, the Union Pacific Railroad serves a huge swathe of the Mid and Western U.S., from the Great Lakes and the Deep South to the Pacific coast. The vast array of locomotives—over 8,000—and diversity of loads combined with ever-changing scenery make for fascinating viewing. This collection of photographs, mainly from the south-western states, attempts to show the reader just a small selection of the scenes and variety that the Union Pacific has to offer.