 They also represented the largest Asian community in America and made a significant contribution in building the First Transcontinental Railroad of United States.The Central Pacific Railroad (CPRR) is the former name of the railroad network built between California and Utah that formed part of the "First Transcontinental Railroad" in North America.About 12,000 such emigrant workers were employed as laborers by the Central Pacific Railroad representing 90 percent of the entire work force.