The line is served at all times by the J train, although on weekends, the two southernmost stations are closed. The M train provides weekday service north of Chambers Street, while during rush hours, the M train serves the full line when service is extended to Bensonhurst, Brooklyn. In addition, the Z provides supplemental rush hour service, operating in the peak direction.
The BRT began operating through a short piece of subway, coming off the Williamsburg Bridge under Delancey Street to Essex Street, on September 16, 1908. The Centre Street Loop was opened to Chambers Street (at the Brooklyn Bridge) on August 4, 1913, with temporary operation at first on the two west tracks. The south tracks on the Manhattan Bridge, also running into Chambers Street, were placed in service on June 22, 1915. An extension south from Chambers Street to the Montague Street Tunnel, known as the Nassau Street Loop, was not completed until May 30, 1931.
Plans for the Chambers Street area changed several times during construction, always including a never-completed connection to the Brooklyn Bridge tracks. By 1910, only the west two tracks were to rise onto the bridge, and the east two were to continue south to the Montague Street Tunnel. As actually built for the 1931 opening south of Chambers Street, the two outer tracks ran south to the tunnel, while the two inner tracks continued several blocks in a lower level stub tunnel to allow trains to reverse direction.
On September 20, 2004, northbound trains began running on the second track from the west, and the former northbound platforms at Canal Street and Bowery were closed off. The second track from the east was removed.
|Station||Services||Opened||Transfers and notes|
|Begins as the BMT Jamaica Line comes off the Williamsburg Bridge ()|
|Essex Street||September 16, 1908||IND Sixth Avenue Line at Delancey Street|
|Chrystie Street Connection local tracks split ()|
|Bowery||August 4, 1913|
|Canal Street||August 4, 1913||BMT Broadway Line at Canal Street ()|
IRT Lexington Avenue Line at Canal Street
|Former Connection to Manhattan Bridge|
|Chambers Street||August 4, 1913||IRT Lexington Avenue Line at Brooklyn Bridge–City Hall|
|Fulton Street||May 30, 1931||IRT Broadway–Seventh Avenue Line at Fulton Street ()|
IRT Lexington Avenue Line at Fulton Street ()
IND Eighth Avenue Line at Broadway–Nassau Street
|Broad Street||May 30, 1931|
|Merges with the BMT Broadway Line and becomes the BMT Fourth Avenue Line via the Montague Street Tunnel (from the Nassau Street Line; from the Broadway Line)|