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In page First transcontinental railroad:

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Former Union General John "Jack" Casement was hired as the new Chief Engineer of the Union Pacific. He equipped several railroad cars to serve as portable bunkhouses for the workers and gathered men and supplies to push the railroad rapidly west. Among the bunkhouses, Casement added a galley car to prepare meals, and he even provided for a herd of cows to be moved with the railhead and bunk cars to provide fresh meat. Hunters were hired to provide buffalo meat from the large herds of American bison.[citation needed]