The Brooklyn–Manhattan Transit Corporation (BMT) was an urban transit holding company, based in Brooklyn, New York City, United States, and incorporated in 1923. The system was sold to the city in 1940. Today, together with the IND subway system, it forms the B Division of the modern New York City Subway.
The original BMT routes form the J/Z, L, M, N, Q, R and W trains, as well as the Franklin Avenue Shuttle, with the IND B and D using BMT trackage in Brooklyn. The M train enters the IND via the Chrystie Street Connection after crossing the Williamsburg Bridge. The Q, along with some rush-hour N trains enter the IND from the BMT 63rd Street Line. The R train enters the IND via the 60th Street Tunnel Connection.