to Broad Street, the M was extended two stations, from Chambers Street to Broad Street. On October 4, 1969, the Myrtle Avenue Elevated was discontinued south of Myrtle Avenue to Jay Street. To make up for the loss of MJ service, M service was expanded to run during middays, operating weekdays between 6 a.m. and 7 p.m., and a new SS shuttle began running between Myrtle Avenue and Metropolitan Avenue at other times. In August 1972, the off-hour SS shuttle was renamed as part of the M. Effective January 2, 1973, the daytime QJ was truncated to Broad Street as the , and the M was extended beyond Broad Street during the day along the 's former route to Coney Island–Stillwell Avenue, via the Montague Street Tunnel and Brighton Line local tracks. With the extension of the M onto the Brighton Line, there were also changes to D service. Northbound weekday M train service originating at Kings Highway would begin at 5:46 a.m., while northbound service from Coney Island would begin at 6:34 a.m. From 5:40 to 6:34 a.m. northbound D trains would run local from Brighton Beach to Kings Highway, and then run express to Prospect Park. Late morning and early afternoon D trains would from then on run express from Brighton Beach to Kings Highway. The span of D express service to Brighton Beach was extended by 45 minutes to 9:05 p.m. from Prospect Park, and the span of M service from Broad Street to Coney Island was extended by 45 minutes from the previous span of QJ service to cover local stops. Two M trains began service at Brighton Beach in the morning rush hour, and in the early morning, three M trains entered service at Brighton Beach, and six entered service at Kings Highway. In addition, the final nine southbound M trains of the evening terminated at Brighton Beach. On May 13, 1974, three northbound early morning trains that were placed into service at Brighton Beach were replaced with two trains entering service at Kings Highway and one entering service at Brighton Beach. The local K (renamed from KK in 1973) was eliminated on August 27, 1976, and M express service between Myrtle Avenue and Marcy Avenue ended. On December 3, 1979, four northbound weekday morning rush hour trains that had been put into service at Kings Highway began service at Brighton Beach. 1986–2004 A six-month