The Chrystie Street Connection is a set of New York City Subway tunnels running the length of Chrystie Street on the Lower East Side of Manhattan. It is one of the few track connections between lines of the former Brooklyn–Manhattan Transit Corporation (BMT) and Independent Subway System (IND) divisions, which together constitute the system's B Division. A major branch of the IND Sixth Avenue Line, it connects the Sixth Avenue Line to the BMT Brighton Line and BMT Fourth Avenue Line via the north side of the Manhattan Bridge and to the BMT Jamaica Line over the Williamsburg Bridge. The project, opened in 1967 and 1968, also includes the Sixth Avenue Line's Grand Street and 57th Street stations, the latter of which is not part of the connection itself. The connection was originally conceived as part of the long delayed Second Avenue Subway, and, along with the 3 stations added with the opening of phase 1, is one of the few completed sections of the project. Route description Manhattan Bridge connection The two tracks that run the full length of the connection begin as a continuation of the IND Sixth Avenue Line express tracks east of Broadway–Lafayette Street. These tracks include the line's only station, Grand Street, and connections to the two northern tracks over the Manhattan Bridge. The IND Sixth Avenue Line express tracks formerly continued east, ending slightly east of the Second Avenue station, and were planned to extend into Brooklyn and beyond as part of a never-built major system expansion called the IND Second System. Those tracks still exist at Second Avenue station, but now connect to the local tracks west of the station. The two tracks on the north side of the Manhattan Bridge formerly carried trains to the BMT Broadway Line, which now connects to the tracks on the south side of the bridge. The south side tracks had been connected to the BMT Nassau Street Line, carrying the Nassau Street Loop service via Chambers Street from 1915. The northern tracks of the bridge saw heavier traffic loads because it led to Midtown Manhattan, compared to the southern tracks, which made three stops in Lower Manhattan before returning to Brooklyn. As a result of the uneven traffic distribution, the Manhattan Bridge started tilting to its north side. The connection to the Nassau Street Line was cut north of Chambers Street at the Manhattan Bridge end