transfers to the South Station intercity and commuter terminal, and, beginning in 1916, to the Cambridge–Dorchester tunnel (now the Red Line). Next was Rowes Wharf, at Broad Street and High Street, with a transfer to the Boston, Revere Beach and Lynn Railroad via a ferry from Rowes Wharf to East Boston. Continuing along Atlantic Avenue, the next station, at State Street, was named State Street, and had, beginning in 1904, a transfer to the East Boston tunnel (now the Blue Line). After merging with Commercial Street, Battery Street Station, just north of Battery Street, provided access to Boston's North End. Just south of Battery Street, on the east side, was the Boston Elevated Railway's Lincoln Wharf Power Station. At Keany Square, the Atlantic Avenue Elevated met the Charlestown Elevated, the north part of the Main Line, at a full three-way junction (Tower C), with the Charlestown El heading west on Causeway Street and into the subway, on the one hand, and north over the Charlestown Bridge, on the other. The Union Freight Railroad ran underneath the El on Atlantic Avenue and Commercial Street, carrying freight between the lines terminating in North Station and South Station. In 1908, the Washington Street tunnel opened, rerouting the Main Line. At this time, the Tremont Street subway was switched back to streetcar-only service. As a consequence, the southern junction (Tower D) was reconfigured, with the Main Line heading north from it on the east side of Washington Street to the Oak Street incline into the tunnel. Decline Service patterns originally included through service over the Main Line and additional Washington Street Elevated service looping via the tunnel one way and the El the other way. On January 4, 1919, the BERy increased service through the tunnel from three-minute to two-minute headways. Atlantic Avenue service was reduced to a North Station–South Station shuttle, with Beach Street station closed. On January 15, 1919, the Boston Molasses Disaster damaged the elevated structure north of Battery Street. Shuttle service resumed on March 29; Sullivan–Dudley service was added on June 14 but ended later in the year. On December 6, 1919, the BERy began operating Dudley–South Station service, with trains running through the Washington Street Tunnel to North Station then over the Atlantic Avenue Elevated to South Station. Additional North Station–South Station shuttles were added on January 17, 1920. From 1920 to at least 1922, service from June to