Following the American Civil War, William Mahone (1826–1895) of Petersburg, Virginia was the driving force in 1870 to combine the Norfolk and Petersburg, South Side and the Virginia & Tennessee railroads to form the Atlantic, Mississippi & Ohio Railroad (AM&O). The new line extended from Norfolk to Bristol. After the AM&O struggled to operate for several years under receiverships, the railroad was sold at auction in 1881 and became part of the Norfolk and Western Railway. In 2003, the university accepted its first students in its first Ph.D. program.