FILE - In this May 10, 1869, file photo, provided by the Union Pacific, railroad officials and employees celebrate the completion of the first railroad transcontinental link in Promontory, Utah. The completion of the Transcontinental Railroad was a pivotal moment in the United States, ushering in a period of progress and expansion nationwide. The Union Pacific's Locomotive No. 119, right, and Central Pacific's Jupiter edged forward over the golden spike that marked the joining of the nation by rail. (Andrew Russell/Union Pacific via AP, File)
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