[12][13] 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.

[15] G trains were extended from Smith–Ninth Streets to Church Avenue to provide local service.

[16][5] 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.

[19] In July 2019, the MTA revealed plans to restore express service on the Culver Line between Jay Street and Church Avenue.

[26] On January 18, 2011, the second phase of the Culver Viaduct rehabilitation project began, resulting in the closure of the Manhattan-bound platform.

[30] However, as part of its 2025–2029 Capital Program, the MTA has proposed making the station wheelchair-accessible in compliance with the Americans with Disabilities Act of 1990.

[31] With an elevation of 87.5 feet (26.7 m) above ground level, Smith–Ninth Streets was the highest rapid transit station in the world when it was built.

[32][33][34][a] This elevation was required by now-defunct navigation regulations for tall-mast shipping on the Gowanus Canal, so the elevated structure rises over the entire structure of the Ninth Street Bridge, a vertical-lift bridge which carries its namesake street over the canal.

[38] There were green mosaics along the concrete platform walls reading “Smith–9th St” in white sans-serif lettering, which were replaced with laminated replicas during renovations.