Before the first atomic bomb was completed in 1945 at Los Alamos, New Mexico, the Atchison, Topeka and Santa Fe Railway (AT&SF) was operating twenty-four hours a day hauling war materials and troops across the state on its transcontinental line from Los Angeles to Chicago. Maintenance workers for the tracks and locomotives were provided by the diverse population of New Mexico, including Native Americans, Hispanics, and African Americans. With locomotive...