The Seaboard Coast Line became the CSX Corporation in the 1980s. With the former Atlantic Coast Line main line (A Line) being used as the through route in the combined network, CSX abandoned the S Line between Riceboro, Georgia (just southwest of Savannah) and Bladen, Georgia in 1986 and redesignated the remaining track as the Kingsland Subdivision (a designation which remains on the CSX line south of Yulee). Track between Bladen and Seals was removed in 1990.
The Seaboard Coast Line's transformation into CSX Corporation involved a network reorganization. The Atlantic Coast Line main line (A Line) became a crucial part of their combined network.  CSX abandoned the S Line between Riceboro and Bladen, Georgia in 1986, re-designating the remaining track as the Kingsland Subdivision. This change was followed by the removal of track between Bladen and Seals in 1990.