On this episode of Our American Stories, before America had coast-to-coast rail lines, four men risked everything to make it possible. Known as the Big Four, they built the Central Pacific Railroad and played a crucial role in completing the first transcontinental railroad. Historian Roger McGrath shares how Leland Stanford, Charles Crocker, Collis P. Huntington, and Mark Hopkins changed the course of American history with steel, vision, and sheer determination.

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