Question: Where is the headquarters of the railroad for which the Union Pacific 4466 was built located?

<P0-S0> Union Station is a former train station in Seattle, Washington, United States, constructed between 1910 and 1911 to serve the Union Pacific Railroad and the Milwaukee Road. <P0-S1>  It was originally named Oregon and Washington Station, after a subsidiary line of the Union Pacific. <P0-S2>  Located at the corner of S. Jackson Street and 4th Avenue S. in the Pioneer Square neighborhood, the station opened on May 20, 1911. <P0-S3>  The Milwaukee Road discontinued passenger service to Union Station 50 years later, on May 22, 1961, and the Union Pacific followed suit on April 30, 1971. <P0-S4>  With no passenger rail service serving Seattle from Union Station, the building remained largely empty. <P0-S5>  After nearly 30 years of sitting idle, the station finally experienced an expansive renovation supported by Nitze-Stagen with financial backing from Paul Allen. <P0-S6>  The Union Station renovation was the winner of the 2000 National Historic Preservation Award. <P0-S7>  It now serves as the headquarters of Sound Transit; its grand hall is rented out to the public for weddings and other events. <SEP> <P1-S0>  4466 spent most of its career in Cheyenne, Wyoming, as a shop switcher and was the UP Cheyenne Shop's last steam shop switcher. <P1-S1>  After its stint in Cheyenne, 4466 was transferred to Grand Island, Nebraska, remaining there until 1973. <P1-S2>  it was donated to California State Railroad Museum in 1978. <P1-S3>  In 1984, it was restored to service and pulled museum excursions. <P1-S4> Union Pacific 4466 is an 0-6-0 type steam locomotive built in October 1920 for the Union Pacific Railroad (UP) to perform switching chores and transfer runs. <P1-S5>  In 1986, 4466 ventured to Vancouver, British Columbia, to be part of . <P1-S6>  4466 now resides in retirement. <P1-S7>  It has been sold to the Niles Canyon Railroad to be restored to service. <P1-S8>  As of 2016, the locomotive is at the California State Railroad Museum, in two pieces, preparing to be shipped by truck. <SEP> <P2-S0> The Union Pacific Railroad (or 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. <P2-S1>  The Union Pacific Railroad is the principal operating company of the Union Pacific Corporation (); both are headquartered in Omaha, Nebraska. <P2-S2>  The Union Pacific Railroad system is the largest in the United States and it is one of the world's largest transportation companies. <SEP> <P3-S0> The Feather River Route is a rail line that was built and operated by the Western Pacific Railroad. <P3-S1>  It was constructed between 1906 and 1909, and connects the cities of Oakland, California, and Salt Lake City, Utah. <P3-S2>  The line was built to compete with the Central Pacific Railroad (and later Southern Pacific Railroad), which at the time held a nearly complete monopoly on Northern California rail service. <P3-S3>  The route derives its name from its crossing of the Sierra Nevada, where it follows both the North and Middle Forks of the Feather River. <P3-S4>  The route is famous for its impressive engineering qualities and its considerable scenic value. <P3-S5>  All of the route is now owned and operated by the Union Pacific Railroad; however, the Union Pacific has transferred significant portions of the route to other lines. <P3-S6>  The portion still called the Feather River Route by the Union Pacific runs from the California Central Valley to Winnemucca, Nevada.