Between 1865 and 1869, thousands of Chinese migrants toiled at a grueling pace andin perilous working conditions to help construct the world's first TranscontinentalRailroad. The Central Pacific Railroad first employed 50 Chinese workers on a trial basisas construction progressed through Auburn, California. From there, it is estimated thatduring peak construction, 12,000 Chinese laborers were employed to help build 690miles of track, bore 6,213 feet of tunnel, and construct 35 bridges and trestles for theCentral Pacific. The ultimate impact of Chinese labor was the completion of ManifestDestiny and the development of the Western United States.