New 1840-ft tunnel paralleling old tunnel which had collapsed, was constructed in 120 days to end shutdown of railroad line between Parkersburg and Clarksburg, W Va; several old tunnels were bypassed and others enlarged to eliminate restrictions caused to piggyback trains by 18 low tunnels.
Fast tunneling salvages blocked railroad project
Eng News-Rec
Engineering News-Record ; 172 , n 9
1964
3 pages
Aufsatz (Zeitschrift)
Englisch
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