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Union Pacific Railroad

[[GE Transportation|General Electric]] ET44AH locomotive photographed in June 2016 The Union Pacific Railroad (or legally Union Pacific Railroad Company and simply Union Pacific) is a freight hauling railroad that operates 8,500 locomotives over 32,100 route-miles in 23 states west of Chicago and New Orleans. The Union Pacific Railroad system is the largest in the United States after the BNSF Railway and is one of the world's largest transportation companies. The Union Pacific Railroad is the principal operating company of the Union Pacific Corporation (); both are headquartered in Omaha, Nebraska.

Union Pacific is known for pioneering multiple innovative locomotives, typically the most powerful of their era. These include members of the Challenger-type (such as the 3985, the 3977), and the Northern-type (the 844), as well as the famous Big Boy steam locomotives. Union Pacific ordered the first (diesel) streamliner, the largest fleet of turbine-electric locomotives in the world, and still owns the largest operational diesel locomotive.

The Union Pacific legacy began in 1862 with the original company, called the Union Pacific Rail Road, which was part of the First Transcontinental Railroad project, later known as the Overland Route. The railroad would subsequently be reorganized thrice: as the Union Pacific Railway (which absorbed the original in 1880), as the Union Pacific "Railroad" (which absorbed the Union Pacific Railway in 1897), and finally as a renamed Southern Pacific Transportation Company (which merged with Union Pacific in 1998).

The current Union Pacific corporation began in 1969 as the Southern Pacific Transportation Company; it would eventual grow to include (among others) the Denver and Rio Grande Western Railroad and the St. Louis Southwestern Railway, in addition to its eponymous railroad. The 1998 Union Pacific-Southern Pacific merger was not UP's first: Union Pacific had already merged with Missouri Pacific Railroad, the Chicago and North Western Transportation Company, the Western Pacific Railroad and the Missouri–Kansas–Texas Railroad. However, because the merger with Southern Pacific substantially changed the scope of the Union Pacific railroad, this article will refer to the unmerged system as Union Pacific (Mark I), and the merged system as Union Pacific (Mark II).

Union Pacific (Mark II)'s main...
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