Tunnel design question

[NW Mailing List]

http://www.thefutureneedsus.com/latest-news/norfolk-southern-raises-the-roof-on-the-heartland-corridor/
 
Good article from the Heartland Corridor site shows the excavator at work inside
of Big Sandy.
 
There is also a video on the site about "raising the roof"
 
Good resources.
Gene


Gene Bowker http://genebowker.com/
The Railroad Examiner - http://railfan.biz