Rutgers Street Tunnel

IND Sixth Avenue Line
The B, D, F, and M, which use the Sixth Avenue Line through Midtown Manhattan, are colored orange.
Overview
Type	Rapid transit
System	New York City Subway
Termini	South of 59th Street–Columbus Circle; 57th Street North of Jay Street–MetroTech; south of Grand Street
Stations	14
Daily ridership	669,852
Operation
Opened	1936-1968
Owner	City of New York
Operator(s)	New York City Transit Authority
Character	Underground
Technical
Number of tracks	2-4
Track gauge	4 ft 8 1⁄2 in (1,435 mm)
Electrification	600V DC using a third rail

The IND Sixth Avenue Line is a rapid transit line of the B Division of the New York City Subway in the United States. It runs mainly under Sixth Avenue in Manhattan, and continues south through the Rutgers Street Tunnel to Brooklyn. It was the last trunk line of the Independent Subway System, completed in 1940. The B, D, F, and M, which use the Sixth Avenue Line through Midtown Manhattan, are colored bright orange.

The following services currently use part or all of the Sixth Avenue Line, whose services' bullets are colored bright orange:

The majority of the Sixth Avenue Line has four tracks, two local and two express. At each end, these pairs of tracks split, giving the line two north and two south ends. One of the north ends is at 57th Street, where two tracks lead south under Sixth Avenue from the IND 63rd Street Line (used by the F train at all times). The other is just south of 59th Street–Columbus Circle, where a two-track line splits from the IND Eighth Avenue Line at a flying junction (with connections to the local and express tracks), immediately turns east under 53rd Street, and crosses the IND Queens Boulevard Line, which parallels it just to the north. At Seventh Avenue, the southbound track is above the northbound track (the same is true on the Queens Boulevard Line, though north is the opposite direction from the Sixth Avenue Line). These tracks are used by the B and D express trains.