At which Utah location did the Union Pacific and Central Pacific railroads meet in 1869?

The Union Pacific and Central Pacific railroads met at Promontory Summit in Utah Territory on May 10, 1869.

The Union Pacific built westward from the Missouri River, while the Central Pacific built eastward from Sacramento, California. Their meeting created the first continuous railroad connection between the eastern United States and the Pacific coast, greatly reducing the time and cost of cross-country travel.

Central Pacific president Leland Stanford ceremonially drove the final, often-called “Golden Spike,” using a silver hammer. The famous ceremony marked the joining of the lines, although the railroad's western connection to the San Francisco Bay area involved additional track and ferry arrangements.

Promontory Summit is sometimes confused with nearby Ogden, which later became an important interchange point. The original meeting site is now preserved as Golden Spike National Historical Park, where historic locomotives and reenactments commemorate the event.