WATCH: Celebration of the 150th anniversary of the completion of the Transcontinental Railroad

PROMONTORY, Utah (AP/ABC4 News)- Thousands are gathered Friday in Promontory where the final spikes were hammered into the ground 150 years ago to mark the finish of the nearly 1,800-mile rail line, triggering a famous telegraph that set off celebrations around the nation.

The historic reunion photo will be recreated as part of the event.

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Reenactment of historic photo>>

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