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[ New Search ] Chicago Subway System: Leaving the Compressed Air Lock Location : Chicago, IL Date : Jun, 1940 Agency : PWA Owner : NARA (SPB) Medium : B&W Photo Control Number : P-3278 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). Workers leaving the compressed air lock with carload of muck in Route 2. Listed Under: [Transportation][Subways][Chicago Subway System]