Beginning In 1972, American railroad companies Seaboard Coast Line and the Louisville & Nashville Railroad began jointly marketing themselves as the Family Lines System. This also extended to their subsidiary companies the Georgia Railroad , the Atlanta and West Point Railroad , the Clinchfield Railroad , and the Western Railway of Alabama . The use of this marketing device persisted until 1983, when a merger between Seaboard Coast Line and the Louisville and Nashville resulted in the Seaboard System Railroad, which in 1986 became CSX Transportation.