The CC Subdivision is a railroad line owned by CSX Transportation in the U.S. State of Kentucky.

During the Civil War, the railroad played a major role ferrying Union supplies and soldiers south from Cincinnati through neutral Kentucky.

[7] The section of track between Livingston and East Bernstadt consists of a long series of steep grades, sharp curves, and tunnels known as Crooked Hill.

In 1964, the original line was abandoned in favor of the newer 1908 alignment, returning the hill to single-track territory.

[8] As of July 2021, CSX is in the process of removing the double-track at the south end of the subdivision near Corbin, Kentucky.