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The '''Union Pacific Railroad''' (UP), headquartered in Omaha, Nebraska, is the largest and oldest operating railroad network in the United States, and as of 2009 covers 23 states in the western two-thirds of the United States. It is an operating subsidiary of Union Pacific Corporation. James R. Young is president, CEO, and Chairman.<ref>[http://www.uprr.com/aboutup/exec/index.shtml#young "Executive Profiles - James R. Young, President and Chief Executive Officer" Union Pacific Railroad, November 2009</ref><ref>[www.uprr.com/newsinfo/releases/financial/2007/0130_youngceo.shtml "Union Pacific Elects President and CEO James R. Young Chairman of the Board"] Union Pacific Railroad, January 30, 2009</ref>

UP's route map covers most of the central and western United States west of Chicago, Illinois, and New Orleans, Louisiana. As of 2009, UP operates on 32,000 miles of track, of which it owns outright {26,949 miles, both numbers representing the highest amount of any railroad currently operating in the United States.<ref>[http://aar.org/PubCommon/Documents/AboutTheIndustry/RRProfile_UP.pdf "Union Pacific Railroad Company" ] Association of American Railroads, January 17, 1008}</ref><ref>[http://aar.org/AboutTheIndustry/RailroadProfiles.asp "Railroad Industry Profiles: Association of American Railroads" ] Association of American Railroads, 2008</ref> It has achieved this size as a result of purchasing a large number of other railroads, notably the Missouri Pacific, Chicago and North Western Railway, Western Pacific Railroad, Missouri-Kansas-Texas, and the Denver and Rio Grande Western Railroad (including the Southern Pacific Railroad). Currently, Union Pacific owns 26% of Ferromex while Grupo Mexico owns the remaining 74%.