Construction details of tunnel recently completed by Municipal Railway of San Francisco; length 4232 ft., width 25 ft., height above rail grade 18 ft. 9 in.; constructed on 3 per cent grade.
Frisco's sunset tunnel
Shop Roadway
Shop and Roadway ; 1 , n 8
1928
3 pages
5 Figs.
Aufsatz (Zeitschrift)
Englisch
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