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BEFORE THE BLUEPRINTS
7 other sections not shown
actual air pressure ballasted track Below—A blasting Board of Transportation borings bottom bucket Budapest Buenos Aires building line built bypass cables cars compressed-air concrete contract drawings courtesy of Spencer crane crew cross-beams curve cut-and-cover decking digging drilling ducts dumped dynamite earth electric elevated elevated railway engineers fastened feet ground heavy hole Independent Subway Independent Subway System industrial track installed jacks laid machine Manhattan method miles modern subway Moscow muck lock operation overhead picture piece piles pipe power shovel railways rapid transit rivet rock tunnel route sewer shaft shoring side sidewalk signal equipment station finish steam shovel steel girders street surface subgrade subsurface structures subway construction subway cut subway excavation subway structure subway systems surveyors switch temporary third rail tion traffic train tubes underground underpinning walls Washington Heights White and Prentis wires wooden workmen York York City