The D Sixth Avenue Express is a rapid transit service in the B Division of the New York City Subway. Its route emblem, or "bullet", is colored , since it uses the IND Sixth Avenue Line in Manhattan. The D operates at all times between 205th Street in Norwood, Bronx, and Stillwell Avenue in Coney Island, Brooklyn via Grand Concourse in the Bronx, Central Park West and Sixth Avenue in Manhattan, the north side of the Manhattan Bridge, and Fourth Avenue and West End in Brooklyn. During daytime hours, the D runs express between 145th Street in Manhattan and 36th Street–Fourth Avenue in Brooklyn and local elsewhere. During rush hours in the peak direction, the D also runs express between Fordham Road in the Bronx and 145th Street in Manhattan. Overnight D service is only express in Manhattan and local elsewhere. In its early years, the D ran to World Trade Center in Lower Manhattan via the lower IND Eighth Avenue Line. From 1954 to 1967, the D ran via the IND Culver Line to Coney Island. With the completion of the Chrystie Street Connection, service was rerouted via the BMT Brighton Line, running there from 1967 to 2001. A short-lived D service ran via the BMT Broadway Line in Manhattan to the Brighton Line in Brooklyn, while D service used the Sixth Avenue, Central Park West, and Concourse Lines in Manhattan and the Bronx. History Early history D service began on December 15, 1940, when the IND Sixth Avenue Line opened. It ran from 205th Street, the Bronx to World Trade Center (at that time called Hudson Terminal) on the IND Eighth Avenue Line at all times, switching between the IND Sixth Avenue to the Eighth Avenue Lines just south of West Fourth Street–Washington Square. Service ran express via the Concourse Line during rush hours. Two trains started service at Bedford Park Boulevard in the morning rush hour. D service was increased on October 24, 1949, in order to offset the discontinuation of C service, which ran express via the Concourse Line and the Eighth Avenue Line. After the morning rush hour on weekdays, several D trains terminated at Bedford Park Boulevard. On December 29, 1951, Saturday peak direction express service in the Bronx was discontinued, along with the discontinuation of Saturday CC local service. On October 30, 1954, the Culver Ramp, a connection between the IND South Brooklyn