Difficulties that developed in 1830-ft double-track bore while excavation was under way for freeway overhead, and movements that were discovered taking place in double-track tunnel on Southern Pacific at San Francisco are discussed; measures taken to stabilize tunnel. (See also v 64 n 12 Dec 1968 p 20-2) (12842)
Trouble at SP's Potrero Hill tunnel
Ry Track Struct
Railway Track and Structures ; 65 , n 1
1969
3 pages
Aufsatz (Zeitschrift)
Englisch
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