Six men spanning five generations and 150 years:

George M. Bretz (1842-1895) Philadelphia & Reading Railroad, 1870s-1880s

William H. Rau (1855-1920) Lehigh Valley RR and Pennsylvania Railroad, 1890s

John Horgan, Jr. (1859-1926) Delaware & Hudson Railway, 1905-1926

Watson Bunnell (1871-1950) Delaware, Lackawanna & Western Railroad, 1905-1919

George Harvan (1921-2002) Lehigh Coal & Navigation Co. / Lanscoal 1949-1972

Scott D. Herring (1960-present) Independent, 1973-onward