turn trains coming from either direction BMT Broadway Line at Whitehall Street – middle track used to turn southbound () and northbound () trains Additionally, there are several pocket tracks in the subway where the line temporarily widens from two to three tracks, such as east of Eighth Avenue on the BMT Canarsie Line, and south of Court Square on the IND Crosstown Line. Four-tracked portions Quadruple-tracked portions of track are fairly common in the subway system. This makes it unique among most metro systems in the world, as most others only have two tracks per line. Generally, these portions are a pair of express and a pair of local tracks unless otherwise noted. Trunk lines: IND Sixth Avenue Line between Broadway– Lafayette Street and 47th–50th Streets IND Eighth Avenue Line between Chambers Street–World Trade Center and 168th Street, and again at Dyckman Street (two local tracks and two tracks leading to the 207th Street Yard) IRT Lexington Avenue Line between Brooklyn Bridge–City Hall and 125th Street IRT Broadway–Seventh Avenue Line between Chambers and 96th Streets BMT Broadway Line between Canal Street and 57th Street–Seventh Avenue BMT Nassau Street Line at Chambers Street (originally a four platform station) Branch lines: Manhattan branches: 63rd Street Lines at Lexington Avenue (two levels of one-direction tracks, with both levels containing one track each of IND and BMT, with connections between lines on both levels) Chrystie Street Connection (one pair IND and one pair BMT) Manhattan Bridge (one pair of tracks on each of the north and south sides of the bridge) Queens branches: IND Queens Boulevard Line east of Queens Plaza IND Rockaway Line north of Jamaica Bay Archer Avenue Lines from Sutphin Boulevard and east (two levels of paired tracks: all IND on one, all BMT on the other, without connections between lines) IRT Flushing Line and BMT Astoria Line at Queensboro Plaza (two levels of one-direction tracks, with both levels containing one track each of IRT and BMT, with a non-revenue connection between lines on upper level) Brooklyn branches: IRT Eastern Parkway Line (entire line) IND Culver Line north of Church Avenue IND Fulton Street Line between Hoyt–Schermerhorn Streets and Euclid Avenue BMT Brighton Line between Ocean Parkway and Prospect Park BMT Fourth Avenue Line north of 59th Street Manhattan Bridge (one pair of tracks on each of the north and south sides of the bridge) BMT Sea Beach Line (entire