The Florida Southern Railway (later known as the Florida Southern Railroad) was a railroad that operated in Florida in the late 1800s. It was one of Florida's three notable narrow gauge railway when it was built along with the South Florida Railroad and the Orange Belt Railway. The Florida Southern was originally chartered to run from Lake City south through central Florida to Charlotte Harbor. However, with the influence of Henry B. Plant, it operated with two discontinuous segments that would be part of the Plant System, which would later become part of the Atlantic Coast Line Railroad.