From 1862 to 1869 the Central Pacific Railroad, building from the West, and the Union Pacific Railroad, building from the East, raced to complete the first transcontinental railroad. They met in Promontory, Utah and laid the last rail on May 10, 1869. Alfred A. Hart was the official photographer for the Central Pacific during construction and produced 364 stereo images, publishing them under the A.A. Hart label. In 1870 Watkins aquired the Hart negatives and published them under the series title Watkins Pacific Railroad.

The stereoviews are organized numerically using the original view numbers. Where a Watkins published view is not available, the same view on a A.A Hart mount has been substituted. Watkins often cropped the images differently than Hart, so in some cases both the Watkins and Hart views are shown.

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