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While construction of the Pacific Railroad ostensibly began during the Civil War, it was not until that great conflict was over that it really got rolling. In a race for government subsidies and land grants, the Central Pacific built eastward from Sacramento, California, while the Union Pacific built westward from Omaha, Nebraska. The two railroads met at Promontory Summit, just north of Great Salt Lake, Utah Territory, on May 10th 1869. It was a watershed moment.