Line to the Second Avenue Line. Service history The first segments of the two lines opened on October 29, 1989; the IND line opened between 57th Street and 21st Street–Queensbridge, and the BMT line opened between 57th Street-Seventh Avenue and Lexington Avenue-63rd Street. The BMT 63rd Street Line was not used for passenger service. The IND Line was usually served by , and trains; during this time, Q trains ran on the IND Sixth Avenue Line due to reconstruction of the Manhattan Bridge. From the line's opening until September 1990, service was provided by Q trains during weekdays, by B trains during weekends, and by an F/Q combination route late nights. Starting in September 1990, evening Q service was replaced by B trains instead. In April 1993, the F/Q combination designation was dropped and was simply known as F. The JFK Express also served the IND line very briefly; the service was discontinued on April 15, 1990. From April to November 1995, as part of the Manhattan Bridge reconstruction, the bridge's north side (Sixth Avenue) tracks closed during middays and weekends; the Q ran on the BMT Broadway Line during these times, using the BMT 63rd Street Line and switching to the IND 63rd Street Line to Queens west of Lexington Avenue station. In May 1997, 63rd Street Shuttle service via the IND Sixth Avenue Line replaced F service during late nights. Between February 22, 1998, and May 22, 1999, service between the Sixth Avenue Line and the 63rd Street Line was suspended because of construction on the IND Line. B and Q trains were cut back to 57th Street, and the late night shuttle suspended. During this time, a different shuttle provided full-time service between 21st Street–Queensbridge and the BMT Broadway Line; for instance, in 1995, this shuttle switched between the IND and BMT Lines west of Lexington Avenue station. On May 22, 1999, the B and Q returned to 21st Street–Queensbridge. On July 22, 2001, the north side tracks of the Manhattan Bridge, which served the Sixth Avenue Line, closed. B and Q service on the IND 63rd Street Line was replaced with a full-time shuttle via the Sixth Avenue Line. On December 16, 2001, the 63rd Street Connector to the IND Queens Boulevard Line officially opened, and the F was rerouted to serve the IND Line at all times, replacing the shuttle and assuming its current service