USA HISTORY

Detailed explanation-1: -As Central Pacific laid tracks eastward, Union Pacific was working westward and the race to Promontory Summit, Utah, where they would eventually meet on May 10, 1869, was on.

Detailed explanation-2: -From May-December 1869, Promontory was the terminus of the transcontinental railroad (the junction point for Central Pacific and Union Pacific Railroads).

Detailed explanation-3: -Promontory Point is the cape or southernmost point of the peninsula formed where the Promontory Mountains project into the northern Great Salt Lake in southeastern Box Elder County, Utah, United States.

Detailed explanation-4: -In May 1869, the railheads of the Union Pacific and the Central Pacific railroads finally met at Promontory Summit, Utah Territory. A specially-chosen Chinese and Irish crew had taken only 12 hours to lay the final 10 mi (16 km) of track in time for the ceremony.

Detailed explanation-5: -On May 10, 1869, the presidents of the Union Pacific and Central Pacific railroads meet in Promontory, Utah, and drive a ceremonial last spike into a rail line that connects their railroads. This made transcontinental railroad travel possible for the first time in U.S. history.