April 1961. The NX designation was used for a rush hour peak-direction "super-express" service along the express tracks of the Sea Beach Line, beginning in the AM rush hour at Brighton Beach on the BMT Brighton Line, running through Coney Island, and then following the N route to 57th Street–Seventh Avenue. (Reverse in the PM rush hour.) This short-lived service began on November 27, 1967 (with the opening of the Chrystie Street Connection) and ended April 12, 1968 due to low ridership. Starting on Monday, April 15, 1968, the five NX trips instead ran as N trips. On December 31, 1972, all late night trains began running local in Brooklyn. Late weekday evening trains, weekend southbound trains, and northbound early weekday trains began stopping at 53rd Street and 45th Street. 1970–1980 On August 30, 1976, weekday N service was extended north over the BMT 60th Street Tunnel Connection to Forest Hills–71st Avenue to replace the discontinued EE. While many N trains ran the full route from Coney Island to 71st Avenue, via the Manhattan Bridge and Broadway Express, some trains ran local during the rush hours only (southbound in the AM rush hour, and northbound in the PM rush hour) between Whitehall Street–South Ferry in Lower Manhattan and Forest Hills–71st Avenue, which had been the former EE route; these trains were noted with diamond N bullets from 1979. Trains stopped terminating at Kings Highway in the AM rush hour. On January 24, 1977, as part of a series of NYCTA service cuts to save $13 million, many subway lines began running shorter trains during middays. As part of the change, N trains began running with four cars between 9:30 a.m. and 2:15 p.m. On August 27, 1977, N service was cut back during late nights, only operating between 36th Street and Coney Island. Northbound trains ran express between 59th Street and 36th Street while southbound trains ran local. 1980–1990 On November 26, 1984, evening rush hour trains that terminated at Kings Highway were extended to Coney Island. Reconstruction of the Manhattan Bridge between 1986 and 2004 disrupted N service, usually rerouting it via the Montague Street Tunnel. On April 26, 1986, the north side tracks (leading to the IND Sixth Avenue Line) were closed and services that normally ran on them were moved to the south side, running via the BMT Broadway Line. Because of the large amount of train