company formed by the merger of the Chessie System, Inc., and Seaboard Coast Line Industries, Inc., in 1980. It operates railroads in 18 states, located mainly east of the Mississippi River, and in Ontario.

The Chessie System was created as a holding company for the Chesapeake and Ohio Railway Company (q.v.), which had gained control of the Baltimore and Ohio Railroad Company (Baltimore and Ohio Railroad) (q.v.) and the Western Maryland Railway Company in 1960 and 1967, respectively. Its routes extend from the Great Lakes to the Chesapeake Bay and the Ohio Valley, with lines to Philadelphia and St. Louis.

Seaboard Coast Line Industries controls Seaboard System Railroad, Inc., which operates lines from the Gulf of Mexico to the Chesapeake Bay and the Ohio Valley, with others extending to Chicago and St. Louis.