line) The Bronx has no four-tracked lines. Pocket tracks are not included. Defunct lines The following New York City Subway lines are either entirely defunct or have major portions no longer in service. Defunct spur lines with one station, such as the South Ferry loops, are not included in this list, nor are surface transit lines. Vestiges of former lines IRT White Plains Road Line: Just north of the Third Avenue–149th Street station, exiting the tunnel portal, one can see the initial framework of the IRT Third Avenue Line. There used to be a connection from the White Plains Road line to the Third Avenue El, which ran south across the Harlem River to Manhattan. IRT White Plains Road Line: The other end of the Third Avenue El connected to the White Plains Road line at the lower level of the Gun Hill Road station (closed 1973). Also on the White Plains Road line is the remnant of the short section of track to the original Bronx Park terminal. IRT Jerome Avenue Line: North of the 161st Street–Yankee Stadium station is the framework for the connection from the IRT Ninth Avenue Line. IRT Dyre Avenue Line: The Dyre Avenue Line was part of the New York, Westchester, and Boston Railway; it continued north beyond Eastchester–Dyre Avenue to White Plains and Port Chester; and south of the present connection to the White Plains Road line at East 180th Street, to 133rd Street where it ran alongside the New Haven Railroad. The platforms of the NYW&B station are still visible at East 180th Street station and are sometimes used to store trains. The structure south of East 180th Street ends abruptly at the Lebanon Street. IRT Flushing Line: Part of the trackway from the Queensboro Bridge and the IRT Second Avenue Line is still visible at the east end of Queensboro Plaza. BMT Nassau Street Line/BMT Broadway Line: The BMT Nassau Street Line used to connect to the south side of the Manhattan Bridge north of Chambers Street. The trackways were disconnected from the Manhattan Bridge after the Chrystie Street Connection opened. Also, heading northbound over the Manhattan Bridge north side, an abandoned tunnel is visible before entering Grand Street. Heading northbound on the south side, the remains of the tunnel to the BMT Nassau Street Line loop is briefly visible. This area was reconfigured as part of the Chrystie Street Connection.