Bronx-bound express service were advanced from 4:30 to 3:30 p.m., and on June 17, 1949, the hours of the morning Manhattan-bound express service were extended from 9:30 to 10:30 a.m. On September 22, 1948, 54 additional cars were placed in service on the 6 train, increasing the lengths of trains from six cars to seven cars. The New York City Board of Transportation, predecessor to the New York City Transit Authority, began to introduce replacements to older subway cars beginning with the R12 cars in 1948. With these cars, numbers were publicly designated to the former IRT lines. Lexington–Pelham trains were assigned the number 6. By 1964, all cars had the route numbers on them. From December 15 to December 22, 1950, the weekday rush hour trains from Pelham Bay Park were extended to South Ferry. Under the New York City Transit Authority On June 23, 1956, Saturday morning express service began operating local. On March 1, 1960, late night express service on the 4 was suspended when the 4 and 6 ran local in Manhattan together. On April 8, 1960, late night and weekend evening trains were extended to South Ferry. On October 17, 1965, late night 4 service began running express once again, and weekend evening 6 service was extended to South Ferry. Trains were cut back from South Ferry to Brooklyn Bridge on May 23, 1976. Beginning on January 13, 1980, late night service terminated at 125th Street in Manhattan with the again making all stops south of there. This service cut affected 15,000 riders, and was criticized by Manhattan Borough President Andrew Stein as no public hearing was held. On the same day, Bronx express service was expanded to operate during middays, with Pelham Bay trains running express in the peak direction to Brooklyn Bridge in the morning, then to Pelham Bay Park in the afternoon. For a few months in 1985, one scheduled daily 6 train traveled to Atlantic Avenue in Brooklyn before turning for Pelham Bay Park. From January 21 to October 5, 1990, late night service was extended back to Brooklyn Bridge when late night express service on the 4 was restored. But the 6 was then cut back to 125th Street for the last time when late-night express service on the 4 in Manhattan was permanently discontinued. Effective October 3, 1999, the 4 and 6 trains once again began to operate local