traffic now running on those tracks, rush hour and midday N service was rerouted via the Montague Street Tunnel, making local stops in Manhattan and Brooklyn, though evening, night and weekend trains continued to use the bridge and express tracks in Brooklyn. Late evening trains that ran via the bridge also ran local in Brooklyn heading southbound. Six trains only ran between Continental Avenue and Whitehall Street in the AM rush hour, while six trains only ran between Canal Street and Continental Avenue in the PM rush hour. The , which was rerouted from the BMT Brighton Line to the BMT West End Line, replaced the N as the weekday express on the Fourth Avenue Line. Starting on April 28, 1986, one Q train ran to Continental Avenue at 7:05 a.m., and returned in service as an N train, and an N train arriving at Continental Avenue at 3:25 p.m. began returning in service as a B train. These special B and Q trips no longer ran after May 23, 1987. As part of the New York City Transit Authority's proposed service plan to serve the new Archer Avenue Line upper level, the N would have been extended to Jamaica Center during weekdays. When N trains terminated at 71st Avenue or 57th Street–Seventh Avenue during weekends and evenings, G trains would have been extended to Jamaica Center, and during late nights a G train shuttle would have run between Jamaica Center and Van Wyck Boulevard. This service plan would have allowed E and F trains to remain on the Queens Boulevard mainline toward 179th Street. The final service plan, which took effect on December 11, 1988, had the extension served by E trains, with R trains extended to 179th Street. On May 24, 1987, the N swapped northern terminals with the . The N was switched to Astoria–Ditmars Boulevard, while the went to Forest Hills–71st Avenue. This was done to give the R direct access to Jamaica Yard; previously, the N had direct access to both Jamaica Yard and Coney Island Yard, and the R, running from Bay Ridge to Astoria, lacked direct access to any yard. This change was intended to improve the appearance and reliability of service on the R, since all trains on the Astoria and Broadway Lines were part of the graffiti-free program. Trains ran via the Manhattan Bridge during late nights and weekends. Some trains