The CofG sold its interest in 1944. The lines eventually fell under the control of the Seaboard Coast Line Railroad, as a result of a merger between the Atlantic Coast Line and the Seaboard Air Line. All of these lines, plus the Clinchfield Railroad, became the Family Lines System in the 1970s, though all the lines maintained separate corporate identities. Those identities became "fallen flags" when the group was renamed Seaboard System Railroad (SBD). In 1986 SBD merged with Chessie System to form CSX Transportation.