This is the N&S’s Welch tunnel, located just north of Welch WV. It’s about 1300′ long.
Coordinates (decimal) 37.435642, -81.583812
No lie, this once was a busy tunnel…two tracks and all.
If you use Google Earth, check the Historic Imagery of this tunnel and dial it back as far as you can. That shot really shows the tunnel well.
Blogging the Railroad Tunnels 
That is the tunnel my sister got killed in by a train