Duncan Tunnel

The Duncan Tunnel is a railroad tunnel in Edwardsville, Floyd [County, Indiana], USA. At long, it is the longest tunnel in Indiana. The tunnel was initially built for the Air Line, who were unable to find a suitable route over the Floyds [Knobs, Indiana|Floyds Knobs], so they decided to tunnel through them. The tunnel was completed by the Southern [Railway (U.S.)|Southern Railway] in 1881 at a total cost of $1 million. It is still in use by the Norfolk [Southern Railway]. The tunnel passes beneath I-64 intersection #118.