Thomson led a faction that ousted the incumbent board of the Pennsylvania Railroad in 1852; Thomson became president and turned his attention more toward finance than engineering. He repeatedly reorganized the company into more efficient subdivisions, and to better cost accounting, paying careful attention to the selection of vice presidents. His organizational model was widely imitated by other railroads, and set the standard for large American businesses. In 1857 he financed the railroad's purchase of the entire system of state transportation works, consisting of 278 miles of canals and 117 miles of railroad, together with real estate and rail equipment. At a cost of $7.5 million the Pennsylvania now dominated the state and took control of most short-haul traffic from the many towns along its heavily populated route.