Union Pacific Railroad

- The largest freight-hauling railroad in North America
- Operates 8,300 locomotives over 32,200 miles of routes in 23 states 
- Major east-west route in southern Arizona
- Tracks through Marana, Tucson, Sahuarita,Green Valley, Tubac, Rio Rico, Nogales, Benson, Dragoon, Willcox
- The Southern Pacific Railroad (SP), nicknamed "Espee," was a major Class I railroad (1865–1996) that shaped the American West and Southwest (including southern Arizona), stretching from California to New Orleans ... the system was acquired by Union Pacific in 1996.

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