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Promontory, Utah, is historically significant as the site where the first transcontinental railroad was completed on May 10, 1869. This event marked the joining of the Central Pacific and Union Pacific railroads, creating a continuous rail line across the United States. The location is now preserved as the Golden Spike National Historic Site, commemorating this pivotal moment in American history. Replicas of the engines present at the ceremony are on display, and reenactments are held during the summer. The original rails were removed during World War II for scrap metal.

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