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

The Feather River Route is a rail line that was built and operated by the Western Pacific Railroad.  It was constructed between 1906 and 1909, and connects the cities of Oakland, California, and Salt Lake City, Utah.  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.  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.  The route is famous for its impressive engineering qualities and its considerable scenic value.  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.  The portion still called the Feather River Route by the Union Pacific runs from the California Central Valley to Winnemucca, Nevada. <SEP>  4466 spent most of its career in Cheyenne, Wyoming, as a shop switcher and was the UP Cheyenne Shop's last steam shop switcher.  After its stint in Cheyenne, 4466 was transferred to Grand Island, Nebraska, remaining there until 1973.  it was donated to California State Railroad Museum in 1978.  In 1984, it was restored to service and pulled museum excursions.  In 1986, 4466 ventured to Vancouver, British Columbia, to be part of . 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.  4466 now resides in retirement.  It has been sold to the Niles Canyon Railroad to be restored to service.  As of 2016, the locomotive is at the California State Railroad Museum, in two pieces, preparing to be shipped by truck. <SEP> 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.  It was originally named Oregon and Washington Station, after a subsidiary line of the Union Pacific.  Located at the corner of S. Jackson Street and 4th Avenue S. in the Pioneer Square neighborhood, the station opened on May 20, 1911.  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.  With no passenger rail service serving Seattle from Union Station, the building remained largely empty.  After nearly 30 years of sitting idle, the station finally experienced an expansive renovation supported by Nitze-Stagen with financial backing from Paul Allen.  The Union Station renovation was the winner of the 2000 National Historic Preservation Award.  It now serves as the headquarters of Sound Transit; its grand hall is rented out to the public for weddings and other events. <SEP>  The Union Pacific Railroad is the principal operating company of the Union Pacific Corporation (); both are headquartered in Omaha, Nebraska. 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.  The Union Pacific Railroad system is the largest in the United States and it is one of the world's largest transportation companies.