The Chetoogeta Mountain Tunnel (34°50′19″N 85°02′00″W / 34.838689°N 85.033281°WCoordinates: 34°50′19″N 85°02′00″W / 34.838689°N 85.033281°W) refers to two different railroad tunnels passing through Chetoogeta Mountain in Tunnel Hill, Georgia, United States.
The first tunnel, known as the Western and Atlantic Railroad Tunnel at Tunnel Hill, was completed on May 7, 1850, as part of the construction of the Western & Atlantic Railroad (W & A), the first state road in Georgia. It was the first major railroad tunnel in the South and is 1,447 feet/≈0.27 mi or 441 meters in length. It was renovated in 1998-2000 and is now open to the public as a privately owned historic site.
The second tunnel was built from 1926 to 1928 and is 1,557 feet/≈0.3 mi or 475 meters long. It is still in use by CSX Transportation, under lease from the Georgia Department of Transportation. It, like the entire W & A subdivision, is a major route between Atlanta and Chattanooga.