Jacksonville Terminal Subdivision
The Jacksonville Terminal Subdivision is a group of railroad lines owned by CSX Transportation in and around Jacksonville. The Jacksonville Terminal Subdivision includes the S Line, which runs from Jacksonville at Beaver Street near Moncrief Yard west to Baldwin Junction, for a total of 17.8 miles. At the south end it continues south as the Wildwood Subdivision and west as the Florida Gulf & Atlantic Railroad. The A Line runs from just north of Jacksonville Amtrak Station south through Moncrief Yard to St. Johns, for a total of 13.0 miles. At its north end, the A Line continues  south from the Nahunta Subdivision and at its south end it continues south as the Sanford Subdivision. History. Railroad lines in Jacksonville were largely built at the end of the 1800s. CSX's A Line north of Jacksonville (which leads to the Nahunta Subdivision) was originally part of the East Florida Railway. The A Line south of Jacksonville (which leads to the Sanford Subdivision) was part of the Jacksonville, Tampa and Key West Railway. Both lines became part of the Plant System and later the Atlantic Coast Line Railroad. The S Line from Jacksonville west to Baldwin Junction was part  of the Florida Central and Peninsular Railroad, which became part of the Seaboard Air Line Railroad. With a large number of railroads operating in Jacksonville, the Jacksonville Terminal Company was chartered in 1894 to coordinate train movement of multiple railroads in the area, manage yards, and build Jacksonville Union Terminal, which opened in 1919. By 1902, the Jacksonville Terminal Company was jointly owned by the Atlantic Coast Line Railroad, Seaboard Air Line Railroad, Florida East Coast Railway, and the Southern Railway. In 1967, the Atlantic Coast Line Railroad and Seaboard Air Line Railroad merged to form the Seaboard Coast Line  Railroad, which became CSX Transportation in 1986. Though, Norfolk Southern and the Florida East Coast Railway have trackage rights on CSX to interchange with one another and into CSX's Moncrief Yard.