Elimination of tunnels on Southern Pacific lines by excavating through overburden to grade was necessary in order to remove restrictive clearances; grading done by railroads own forces; cost figures demonstrated economy of methods; other tunnels eliminated by relocation of main line.
Railroad tunnels "daylighted" by company forces
Civ Eng (NY)
Civil Engineering (New York) ; 16 , n 1
1946
4 pages
Aufsatz (Zeitschrift)
Englisch
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