Line, and the QJ served "B" stops. This skip-stop pattern, which had operated only in morning rush hours, was extended into afternoon rush hours, but still ran only in the peak direction. The B service was extended during non-rush hours from its former terminus at West Fourth Street–Washington Square to the new 57th Street station, using the local tracks of the IND Sixth Avenue Line. Rush hour trains continued on the established route to Washington Heights–168th Street via the express tracks (and the local tracks of the IND Eighth Avenue Line). The TT shuttle on the BMT West End Line in late evenings, late nights and all day Sunday, was discontinued and replaced by additional B service. The D service now bypassed 14th Street and 23rd Street via the express tracks of the IND Sixth Avenue Line at all times. It had previously done this only during rush hours. This service is taken over by the B and KK. The M (rush hour service) was extended from Chambers Street to Broad Street due to the additional capacity available from the rerouting of the JJ (as the KK). A free transfer was added between 42nd Street–Bryant Park on the IND Sixth Avenue Line and Fifth Avenue on the IRT Flushing Line from 5 AM to 10 PM weekdays. A passageway connecting the stations directly was built later on, and opened in 1972. The following adjustments to the new service were put into effect on August 18, 1968: The D service was truncated to Brighton Beach when it ran express on the BMT Brighton Line (morning rush hours through early evenings). The QB (rush-hour peak direction only) and QJ (morning rush hours through early evenings) were extended from Brighton Beach to Coney Island–Stillwell Avenue. The F ran express on the IND Culver Line during rush hours north of Church Avenue. Several peak-direction rush hour trains were truncated to Kings Highway; the rest provide express service north of Kings Highway. The GG train was extended to Church Avenue during rush hours to replace F local service, but was cut back to Smith–Ninth Streets on January 18, 1976. Later changes These new services began to unravel in response to commuter complaints about the various routings. Many of the new extensions like the NX and RJ quickly disappeared (April 12, 1968 and June 28, 1968, respectively), although the RJ was replaced with a shorter rush