The Union Pacific also acquired large holdings in railroads in the East and later gained control over Western motor-coach lines. In 1936 the railroad initiated the development of Sun Valley, Idaho, into a popular winter resort.
http://encyclopedia2.thefreedictionary.com/Union+Pacific+Railroad
Planned by Theodore Judah, the Central Pacific Railroad was authorized by Congress in 1862. It was financed and built through  The Big Four  (who called themselves The Associates): Sacramento, California businessmen Leland Stanford, Collis Huntington, Charles Crocker, and Mark Hopkins.
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It was reincorporated (1897) as the Union Pacific RR Company in Utah, and under the management of Edward H. Harriman Harriman, Edward Henry,1848–1909, American railroad executive, b.
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The Union Pacific Railroad (reporting mark UP) is a Class I line haul freight railroad that operates nearly 9,000 locomotives over 32,000 route-miles in 23 states west of Chicago, Illinois and New Orleans, Louisiana.
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The Union Pacific Railroad network is the largest in the United States and is serviced by more than 50,000 employees. Union Pacific Railroad is the principal operating company of Union Pacific Corporation (NYSE: UNP); both are headquartered in Omaha, Nebraska.
https://en.wikipedia.org/wiki/Union_Pacific_Railroad
Under terms of the Pacific Railroads Act, the Union Pacific was authorized to build a line westward from Omaha, Nebr., to the California-Nevada line, where it was to connect with the Central Pacific RR—which was to be built simultaneously from Sacramento, Calif.
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Nevertheless, on May 10, 1869, the Union Pacific joined the Central Pacific, NW of Ogden, Utah, thus connecting the Missouri River and the Pacific Ocean by rail and completing the nation's first transcontinental railroad. The joining of the roads was marked in ceremony by the driving of a golden spike.
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Union Pacific Corporation's main competitor is the BNSF Railway, the nation's second largest freight railroad, which also primarily services the Continental U.S. west of the Mississippi River.
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Union Pacific Railroad, In 1865 construction of the Union Pacific was begun from Omaha westward, and a long succession of harrowing construction problems, Indian troubles, and delays were encountered.
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The Central Pacific Railroad (CPRR) is the former name of the railroad network built between California and Utah, US, that built eastwards from the West Coast in the 1860s, to complete the western part of the . First Transcontinental Railroad  in North America. It is now part of the Union Pacific Railroad. Many 19th century national proposals to build a transcontinental railroad failed because of the energy consumed by political disputes over slavery. With the secession of the South, the modernizers in the Republican Party controlled the US Congress.
https://en.wikipedia.org/wiki/Central_Pacific_Railroad
define union pacific railroad
The defination of Union Pacific Railroad is a Class I line haul freight railroad that operates nearly 9,000 locomotives over 32,000 route-miles in 23 states west of Chicago, Illinois and New Orleans, Louisiana. The Union Pacific Railroad is a Class I line haul freight railroad that operates nearly 9,000 locomotives over 32,000 route-miles in 23 states west of Chicago, Illinois and New Orleans, Louisiana. 