local over the Broadway Line since 1920. 3/ (BMT West End Line) trains ran express on the Broadway Line until 1967, when the T became part of the realigned via the IND Sixth Avenue Line. 4/ (BMT Sea Beach Line) trains used the express tracks until the Manhattan Bridge reconstruction in the 1980s, when all N trips became local. (Some had run local since the EE was merged into the N in 1976.) When the Manhattan Bridge south tracks reopened in 2001, the was introduced, at first running express; it became local in 2004, and the N moved back to the express tracks. Several other services have used the express tracks, including the (Sea Beach, 1967–1968) and the (West End) and (Brighton) during closures of the Manhattan Bridge north tracks in the 1980s and 1990s. On May 6, 1985, double letters were eliminated, and the QB was relabeled the Q, and the RR was relabeled the R. Manhattan Bridge reconstruction: 1986–2001 On April 26, 1986, the north side tracks on the Manhattan Bridge leading to the IND Sixth Avenue Line were closed for rehabilitation, and services that had used the north side were moved to the south side, running via the BMT Broadway Line. Because of the large amount of train traffic now running on the bridge's south side tracks, rush hour and midday N service stopped using the bridge, and began running via the Montague Street Tunnel and Lower Manhattan making local stops. However, evening, night and weekend trains continued to use the bridge and express tracks, terminating at 57th Street–Seventh Avenue. B and D services were split. Their service from the Bronx and Upper Manhattan continued to run via the Sixth Avenue Line, terminating at 34th Street. Their service to Brooklyn, however, was rerouted via the Broadway Line express tracks. D service terminated at 57th Street, while B service terminated at Ditmars Boulevard during rush hours, and at Queensboro Plaza during middays, evenings, and weekends. Between April 26, 1986 and May 24, 1987, the N ran express via the Bridge to 57th Street during evenings, nights, and weekends. Afterwards, N service began running local via the Broadway Line during evenings, nights, and weekends, but they still operated over the Manhattan Bridge. On May 24, 1987, when the N and R swapped routes in Queens, there were additional changes in Broadway service. B service during evenings and weekends, stopped