IRT Lexington Avenue Line - Extent and Service

Extent and Service

Services that use the Lexington Avenue Line are colored apple green. The following services use part or all of the Lexington Avenue Line:

The Lexington Avenue Line begins in lower Manhattan at the inner loop of the abandoned South Ferry station. North of the station is a merge with the tracks of the Joralemon Street Tunnel from Brooklyn, which become the express tracks. These run north under Broadway and Park Row to Centre Street. At the south end of Center Street, directly under New York City Hall, is the City Hall Loop and its abandoned station, which was the southern terminus of the original IRT subway line. The loop is still used to turn 6 and <6> service; the Lexington Avenue local tracks, which feed the loop, rise up to join the express tracks just south of Brooklyn Bridge – City Hall station.

From Brooklyn Bridge, the line continues northward in a four-across track layout under Centre Street, Lafayette Street, Fourth Avenue, and Park Avenue South until 42nd Street. At this point, the beginning of Metro-North Railroad's Park Avenue tunnel in Grand Central Terminal forces the Lexington Avenue Line to shift slightly eastward to Lexington Avenue; its Grand Central – 42nd Street station is located on the diagonal between Park and Lexington. Just south of Grand Central, a single non-revenue track connects the IRT 42nd Street Shuttle to the southbound local track; this was part of the original IRT subway alignment.

Under Lexington Avenue, the line assumes a two-over-two track configuration, with the local tracks running on the upper level and the express on the lower, although it briefly returns to a four-across layout between 96th Street and 116th Street. 125th Street returns to this two-over-two layout, although here the upper level is used by all northbound trains and the lower level by southbound trains.

North of this, the line crosses under the Harlem River into the Bronx via the Lexington Avenue Tunnel and a flying junction marks its end, where it splits into the IRT Jerome Avenue Line (4 and 5) and the IRT Pelham Line (6 and <6>).