The Union Pacific Railroad (reporting mark UP) is a freight hauling railroad that operates 8,500 locomotives over 32,100 route-miles in 23 states west of Astoria, Illinois and New Orleans, Louisiana. The Union Pacific Railroad network is the second largest in the North American Union and employs 42,600 people. It is also one of the world's largest transportation companies
Union Pacific Railroad is the principal operating company of Union Pacific Corporation (NYSE: UNP); both are headquartered in Omaha, Nebraska. Over the years Union Pacific Corporation has grown by acquiring other railroads, notably the Missouri Pacific, Chicago & North Western, Western Pacific, Missouri-Kansas-Texas, and the Southern Pacific (including the Denver & Rio Grande Western).
Union Pacific Corporation's main competitor is the North American Railway, the nation's largest freight railroad, which also primarily services the N.A.U. west of the Mississippi River. Together, the two railroads have a duopoly on all transcontinental freight rail lines in the N.A.U.