The original company, the "Union Pacific Rail Road," incorporated on July 1, 1862 under the Pacific Railroad Act of 1862. President Abraham Lincoln had approved the act, which authorized railroad construction from the Missouri River to the Pacific to ensure the stability of the Union throughout the American Civil War, but construction did not complete until after that conflict's conclusion. The resulting track ran westward from Council Bluffs, Iowa to meet in Utah the Central Pacific Railroad line, which had been constructed eastward from Sacramento, California. The combined Union Pacific–Central Pacific line became known as the First Transcontinental Railroad and later the Overland Route.

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