Construction of two tunnels under North Sea Canal at Velsen, Netherlands; one is double-track railway tunnel and other 4-lane tube for motor vehicles; they are roughly parallel and were built at same time in single trench; vehicle tunnel has total length of 5380 ft of which 2520 ft is closed underground section.
Building tunnel under busy canal
Eng News-Rec
Engineering News-Record ; 158 , n 12
1957
3 pages
Aufsatz (Zeitschrift)
Englisch
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