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 three stations added with the opening of phase 1, is one of the few completed sections of the project.[1]