The first Transcontinental Railroad (known originally as the "Pacific Railroad" and also as the “Great Transcontinental Railroad” and the “Overland Route”) was a continuous railroad line constructed between 1863 and 1869. It connected the existing eastern U.S. rail network at Omaha, Nebraska/Council Bluffs, Iowa with the Pacific coast on San Francisco Bay.
While Asa Whitney published his ideas on the idea of a railroad to California in 1849, others also joined the chorus. Eventually Theodore Judah, chief engineer for the Sacramento Valley Railroad, undertook a survey to find a manageable route through the Sierra Nevada mountains and presented his plan to Congress in 1856. The next stop on the timeline is July 1, 1862 when Congress passed the Pacific Railroad Act of 1862 which created the Central Pacific Railroad and the Union Pacific Railroad. In total, the rail line was built by the Central Pacific Railroad Company of California (CPRR), Union Pacific, and Western Pacific Railroad Company over public lands provided by extensive US land grants.
It opened for through traffic on May 10, 1869 when CPRR President Leland Stanford ceremonially drove the gold "Last Spike" (later dubbed the "Golden Spike") at Promontory Summit. The entire line wasn’t completed until November 1869 when the Central Pacific finally connected Sacramento to the east side of San Francisco Bay and Union Pacific connected Omaha to Council Bluffs completed the Union Pacific Missouri River Bridge in 1872.
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