1950 M.T.A. system map, showing the heavy rail and streetcar network and proposed routes. The 1952 extension to Orient Heights is shown under construction; projects including a never-realized second tunnel between Park Street and Scollay Square (Government Center), relocation of the Washington Street Elevated under Shawmut Avenue to Dudley and following the New Haven Railroad to Forest Hills, and the first stage of the Haymarket North Extension to Sulllivan Square are shown as proposed.