and (later renamed the G) trains were extended to Church Avenue, complementing the E. In December 1940, after the IND Sixth Avenue Line opened, E trains were replaced by the , and the GG was cut back to Smith–Ninth Streets. Following the completion of the Culver Ramp in 1954, Concourse Express trains replaced F service to Coney Island. In November 1967, the Chrystie Street Connection opened and D trains were rerouted via the Manhattan Bridge and the BMT Brighton Line to Coney Island. F trains were extended once again via the Culver Line. The center tracks at the station were used for F express service starting in June 1968, while G trains were extended from Smith–Ninth Streets to Church Avenue to provide local service. Express service between Bergen and Church ended in 1976 due to budgetary concerns and passenger complaints, and the GG, later renamed the G, was again terminated at the Smith–Ninth Streets station. In July 2009, the G was extended from its long-time terminus at Smith–Ninth Streets to a more efficient terminus at Church Avenue to accommodate the rehabilitation of the Culver Viaduct. The G extension was made permanent in July 2012. In July 2019, the MTA revealed plans to restore express service on the Culver Line between Jay Street and Church Avenue. Express service started on September 16, 2019. Station layout This station has two island platforms and four tracks. South of this station, the express tracks separate from the local tracks and rejoin beneath them north of Fort Hamilton Parkway, then rise up again. The tile band is mustard yellow with a sienna brown border, set in a three-high "express station" course. The top border is slightly wider than the bottom and bisects the center of the band at regular intervals. This appears to be a modern aberration done during a renovation sometime in the 1980s as historical images show standard IND style color bands before 1972. There is evidence of water damage on both trackside walls. While this station is underground and Fourth Avenue is on an elevated trestle, this station is actually at a higher elevation than Fourth Avenue. This is because Brooklyn's topography slopes downwards towards the west (hence the neighborhood name of Park Slope), allowing the line to enter into the hillside between the two stations. The station contains a full-length mezzanine with exits at 7th Avenue and 8th Avenue. Before January