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[ New Search ] Chicago Subway System: Workers In Underground Tunnel Location : Chicago, IL Date : Jun, 1940 Agency : PWA Owner : NARA (SPB) Medium : B&W Photo Control Number : P-3272 Enlarged Image Description : PWA is financing the construction of the first subway system in Chicago, a 7.7 mile double tube system consisting of two routes, State Street (Route 1) and Deerborn Street (Route 2). View of workers going under compressed air in lock on a section of the State Street route in North Clybourn Avenue. All tunnel work is under compressed air, ranging from 10-15 pounds pressure per square inch. Listed Under: [Transportation][Subways][Chicago Subway System]