Portal:Trains/Featured picture/Week 46, 2005

Union Pacific Railroad 9214, a GE Dash 8-40C, leads an eastbound train up California's Cajon Pass on May 10, 1991.

Union Pacific Railroad is the largest railroad in the United States. Its primary AAR reporting mark is UP. Union Pacific's route map covers most of the central and western United States, west of Chicago and New Orleans. It has achieved this size thanks to purchasing a large number of other railroads; notable purchases include Missouri Pacific (1982), Western Pacific (1983), Missouri–Kansas–Texas (1988), Chicago and North Western (1995), and Southern Pacific (1996) railroads. Union Pacific's chief competitor is BNSF Railway, which covers much of the same territory.