CPRR
As the chief engineer of the Central Pacific Railroad, Judah surveyed the route over the Sierra Nevada along which the railroad was to be built during the 1860s. Failing to raise funds for the project in San Francisco, he succeeded in signing up four Sacramento merchants—the "Big Four": Leland Stanford, Collis P. Huntington, Mark Hopkins, and Charles Crocker. They managed financing and construction of the CPRR.
With their backing, Judah lobbied for federal authorization and government financing of the transcontinental railroad in Washington, D.C.. He contributed to the passage of the 1862 Pacific Railroad Act, which authorized construction of the First Transcontinental Railroad. After passage of the 1862 Act, the Big Four marginalized Judah. They put Crocker in charge of construction. Construction was completed in 1869, with virtually the entire course of the railroad having followed Judah's plans.
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