Georgia's oldest underground trainway, the 1,477-foot Western & Atlantic Railroad tunnel at Tunnel Hill in Whitfield County, was completed in 1849-50. Visitors can now walk inside thanks to a late-1990s restoration funded in part by the federal Transportation Enhancement program.
A few yards to the north is a larger replacement tunnel built in 1928 by the Nashville, Chattanooga & St. Louis Railway, which leased the W&A from the State of Georgia in 1890. Built at a cost of $290,000, it was designed to handle the largest rail cars and locomotives then in use by American railroads. It is still used by NCSL successor CSX Railroad.