Interior of subway, Boylston Street mall Details of iron-work, Boylston Street subway near Station 9+0 Iron-work on section 1, Tremont Street mall Iron-work for 16" water pipe crossing near Park Square entrance of the Common Pipes 3 1/4 Pipes near Boylston Street Pipes near Boylston Street Looking east on Boylston Street Mall of Common, Boston, Mass., November 18, 1895 Row of intermediate columns in four track subway, Tremont Street mall of Common Fourtrack subway, interior before completed Section 1 Work on Section 3 1/4 corner of Park and Tremont Streets Section 2 construction Section 2 Untitled Sand (land?) heater on Common Iron-work crossing western part of Charles Street looking east from Public Garden Tremont Street (?) Untitled Iron-work on Tremont Street mall, looking north, section 1 Traffic on Eliot Street Execavation for ventilating chamber at section 1 Tremont Street mall of Common Bracing in trench at section 2 on Boylstion Street mall, looking westerly Excavation at section 3, looking northerly Tunnel for 24" x 12" gas pipes at section 3 Cave-in of trench for water conduit at section 2, looking easterly Cave-in of trench for water conduit at section 2, looking southerly E. side of Lowell St. near Causeway St. Wall between 14-16 Barton St. Wall between 14-16 Barton St. Underpinning party wall between 6+8 Lowell St. Underpinning party wall between 6+8 Lowell St. Underpinning party wall between 6+8 Lowell St. Causeway St. opposite North Station Steel erection North Station New steel work opposite North Station New steel work North Station Progress view on steel erection North Station Props and showing on building Billerica near Causeway St. Progress on steel erection North Station Lechmere Sq. Progress on steelwork North Station North Station, progress on steelwork North Station, progress view Foor bridge through B+M cabstand, North Station North Station, progress view Progress view opposite North Station North Station, subway incline Lechmere Sq. incline Progress view North Station Progress view North Station