way for the extension of the IRT Flushing Line. Services The following services use part or all of the IND Queens Boulevard Line: During daytime hours, the portion of the line between 36th Street and Forest Hills–71st Avenue is served by four services: the , , , and . The M operates via Sixth Avenue and 53rd Street to Queens Plaza before making local stops to Forest Hills–71st Avenue on weekdays. The R enters Queens Boulevard from the Broadway Line and the 60th Street Tunnel before making local stops to Forest Hills–71st Avenue at all times except late nights. The F train joins the IND Queens Boulevard Line from the 63rd Street Line and runs express to Forest Hills–71st Avenue before making local stops to Jamaica–179th Street at all times. The E train runs from the Eighth Avenue Line and 53rd Street to Queens Boulevard before making express stops along the line (except evenings and weekends when it makes all stops east of Forest Hills–71st Avenue and during late night hours when it runs local on the entire line) to the Archer Avenue Line east of Briarwood. Limited rush hour E trains also run express to Jamaica–179th Street. The entire line is patrolled by NYPD Transit Bureau District 20, headquartered at Briarwood. History Construction The Queens Boulevard Line, also referred to as the Long Island City−Jamaica Line, Fifty-third Street−Jamaica Line, and Queens Boulevard−Jamaica Line prior to opening, was one of the original lines of the city-owned Independent Subway System (IND), planned to stretch between the IND Eighth Avenue Line in Manhattan and 178th Street and Hillside Avenue in Jamaica, Queens. As originally proposed in 1925, the line's junction with the IND Crosstown Line in Long Island City would have been a T-junction, allowing trains from Manhattan to travel south to Brooklyn via the Crosstown line. A map from June of that year shows a proposed alternate routing for the Queens Boulevard Line, that would have had the line turn via Kew Gardens Road after the Union Turnpike station instead of continuing via Queens Boulevard. After proceeding via Kew Gardens Road, the line would have turned via Hillside Avenue. The proposed route via Kew Gardens Road was supported by Queens Borough President Maurice Connolly because it would have served Richmond Hill as well. He also pointed out that there was considerable opposition to building a subway line in front of Maple