Seaboard Coast Line Industries, Inc., incorporated in Delaware on May 9, 1969, was a railroad holding company that owned the Seaboard Coast Line Railroad, its subsidiary Louisville and Nashville Railroad, and several smaller carriers. Its railroad subsidiaries were collectively known as the Family Lines System. Its headquarters were in Jacksonville, Florida in the United States. Through 1979, the Family Lines network totaled 16,326 miles (26,274 km) in 13 states.
The company succeeded SCL Industries, Inc., incorporated August 1, 1968 in Virginia and renamed Seaboard Coast Line Industries, Inc. on February 5, 1969.
On November 1, 1980 Seaboard Coast Line Industries merged with Chessie System, Inc. to form CSX Corporation, and in 1983 the Family Lines units were combined as the Seaboard System Railroad.