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[ New Search ] Chicago Subway System: Clybourn Avenue Portal Approach Location : Chicago, IL Date : Jun, 1940 Agency : PWA Owner : NARA (SPB) Medium : B&W Photo Control Number : P-3271 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 North Clybourn Avenue portal approach showing the bracing. This structure was built by the open cut method. Listed Under: [Transportation][Subways][Chicago Subway System]