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Promontory, Utah, May 10, 1869, when rails of the Central Pacific and the Union Pacific were joined to complete the first transcontinental railroad. The picture is taken from the U.P. locomotive number 119, looking westward. The four companies of the Twenty-first Infantry in formation are visible, as are the Central Pacific's locomotive Jupiter and the tent-buildings of Promontory. This image is a copy of Alfred A. Hart's stereoscopic picture, "The Rival Monarchs." — USHS
