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Union Pacific Elects President and CEO James R. Young Chairman of the Board. Union Pacific Railroad, 30. január 2007. Dostupné online [cit. 2007-01-31].
Union Pacific Railroad Company - 2005 [PDF]. Association of American Railroads, [cit. 2008-01-17]. Dostupné online. Archivované 2008-02-16 z originálu.
Railroad Industry Profiles [online]. Association of American Railroads, [cit. 2008-01-17]. Dostupné online. Archivované 2008-01-22 z originálu.