From the Guidebook:
Here, on January 8, 1863,
Governor Leland Stanford turned the first spade of earth
to begin construction of the Central Pacific Railroad.
After more than six years of labor, crews of the Central
Pacific Railroad from the west and the Union Pacific Railroad
from the east met at Promontory, Utah where, on May 10,
1869, Stanford drove the gold spike signifying completion
of the First Transcontinental Railroad. The Central Pacific
Railroad, forerunner of the Southern Pacific Company,
was planned by Theodore D. Judah and constructed largely
through the efforts of the 'Big Four'-Sacramento businessmen
Leland Stanford, Collis P. Huntington, Charles Crocker,
and Mark Hopkins.