The Nahunta Subdivision is a railroad line owned by CSX Transportation in Florida and Georgia. The line runs along CSX's A Line from Ogeechee, Georgia to Dinsmore, Florida for a total of 129.2 miles (207.9 km). At its north end it continues south from the Savannah Subdivision and at its south end it continues south as the Jacksonville Terminal Subdivision A-Line. The line is double-tracked from Folkston, Georgia south. All of Amtrak's Florida service also traverses the line.
The segment of the line from Folkston to Callahan, Florida is sometimes informally known as the Folkston Funnel by rail enthusiasts since nearly all of CSX's traffic from the midwest and the northeast to Florida converge on that segment, which carries roughly 50-60 trains a day. The Folkston Railfan Platform was built in 2001 by the city for viewing trains.
The segment of the Nahunta Subdivision north of Jesup, Georgia was originally part of the Atlantic and Gulf Railroad, which was chartered in 1856 (five years before the start of the American Civil War). The Atlantic and Gulf Railroad went bankrupt in 1877 and was bought by Henry B. Plant two years later. Plant incorporated it into his Savannah, Florida, and Western Railway (the main line of the Plant System).
From Folkston, Georgia south to Jacksonville, Florida, the line was part of the Waycross and Florida Railway and the East Florida Railway. Those two lines, which were chartered by Henry Plant in 1880, began service in 1881.
The middle segment of the Nahunta Subdivision was built as the Plant System's Folkston Cutoff in 1901. It was built to provide a shortcut and bypass to Waycross, Georgia.
In 1902, the Plant System became part of the Atlantic Coast Line Railroad, with what is now the Nahunta Subdivision becoming part of the Coast Line's main line. Though Atlantic Coast Line became part of CSX Transportation through various mergers from 1967 to 1986. The Nahunta Subdivision continues to be part of CSX's A Line (the designation for the former Atlantic Coast Line main line).
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- "CSX Florida Funnel". TrainWeb. Retrieved 22 September 2018.
- "Atlantic & Gulf Railroad". Georgia's Railroad History & Heritage. Retrieved 22 September 2018.
- "Waycross & Florida Railroad". Georgia's Railroad History & Heritage. Retrieved 22 September 2018.
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