The Duncan Tunnel (also known as the Edwardsville 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, so they decided to tunnel through them.Photo The tunnel was completed by the Southern Railway in 1881 at a total cost of $1 million.Sunny Side of Louisville - Area History It is still in use by the Norfolk Southern Railway.Railroad Depots of Southern Indiana, By David E. Longest. Pg 89. The tunnel passes beneath I-64 intersection #118.
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