Limited midday and all evening service short turns at 145th Street and does not operate to and from Bedford Park Boulevard.

[5] The Chrystie Street Connection and the express tracks of the Sixth Avenue Line opened on November 26, 1967, radically changing service.

[7] On July 1, 1968, the B was rerouted to terminate at the new 57th Street–Sixth Avenue station in Midtown Manhattan during middays and evenings, extending to 168th Street only during rush hours.

[8] On June 1, 1976, the New York City Transit Authority (NYCTA) announced changes in subway service that were expected to save $12.6 million annually and were the third phase of the agency's plan to realign subway service to better reflect ridership patterns and reduced ridership.

The changes were made as part of the $1 million, two-year Rapid Transit Sufficiency Study, and were expected to take place as early as 1982, following public hearings and approval by the Metropolitan Transportation Authority (MTA) board.

[16] On June 1, 1983, the NYCTA proposed changes to increase service along Sixth Avenue and better connecting the line to the Bronx and Queens.

[19] The northern B service ran via Sixth Avenue, using an orange bullet, between 34th Street-Herald Square and 168th Street during rush hours only.

It ran from Coney Island-Stillwell Avenue and terminated at Astoria–Ditmars Boulevard rush hours; Queensboro Plaza middays, evenings, and weekends; and 36th Street late nights as a shuttle.

[18] From April 28, 1986, to May 23, 1987, one PM rush hour train originated from Forest Hills – 71st Avenue instead of Ditmars Boulevard.

[21] Through B service on the Sixth Avenue Line resumed December 11, 1988, when the Manhattan Bridge's north side tracks reopened.

[29] Also on this date, because N service resumed running via the Manhattan Bridge, B trains began skipping DeKalb Avenue.

[30][31] In January 1991, a reduction of service along the Central Park West corridor to remove excess capacity was proposed.

Late night service would remain unchanged as a West End Shuttle between 36th Street and Coney Island–Stillwell Avenue.

[32] The north side of the Manhattan Bridge closed on middays and weekends from April 30, 1995, until November 12, 1995,[33] during which B trains ran only between Pacific Street and Coney Island–Stillwell Avenue, running local on the BMT West End Line and express on the BMT Fourth Avenue Line.

It ran along the Eighth Avenue Line to 145th Street (terminating at Bedford Park Boulevard during rush hours) at all times except late nights.

[49][50][51][52] From September 14, 2009, to October 3, 2011, B trains ran local in Brooklyn due to station renovations on the Brighton Line.

[56] From March 2020 to June 8, 2020, the B was temporarily suspended due to lack of ridership and train crew availability caused by the COVID-19 pandemic.

[3] From August 5, 2024, until early 2025, B trains operate local between Prospect Park and Kings Highway in both directions for accessibility upgrades at the Church Avenue station.