Golden Spike National Historical Park, Historical railroad site in Box Elder County, United States

Golden Spike National Historical Park is a railroad heritage site at Promontory Summit in Box Elder County, Utah. It covers 2,735 acres, including the summit where the rails were joined and the east and west slopes with worker campsites, incomplete cuts and grades. A two-mile rebuilt track runs from the summit to a train storage building, and the visitor center and locomotive shed stand near the junction point.

Central Pacific Railroad and Union Pacific Railroad met here on May 10, 1869, completing the first rail connection between American coasts. The two companies had built from opposite sides of the continent and joined their tracks at this remote location in Utah.

The name comes from the ceremonial golden spike, which was never actually driven into the rails; it was engraved with directors' names and "The last Spike" and is now kept at Stanford University. Each summer, replicas of the Jupiter and No. 119 meet on the tracks in daily demonstrations, while in winter the locomotives can be seen in the engine house.

The visit works well for families and school groups, as the level paths are easy to walk and several covered areas provide shade. During summer months, the locomotives run back and forth regularly, letting guests see the machines up close.

The ten-mile tracklaying record was set on the park's west slope, one of two linear sections added in 1965 along the old right-of-way. The east slope holds the Big Fill, an earth embankment begun in February 1869, and the Big Trestle, a timber bridge started that March.