Editing Independent Subway System (section)

==As built==
[[File:IND after 6th Ave.png|thumb|Service patterns of the IND {{circa|1940}}]]

===The Bronx and Manhattan===
* [[IND Concourse Line|Concourse Line]] ({{NYCS trains|Concourse}}): under the [[Grand Concourse (Bronx)|Grand Concourse]] from 205th Street south to 161st Street, then west under the [[Harlem River]] into Manhattan and south to the Eighth Avenue Line (parallel to the [[IRT Jerome Avenue Line]])
* [[IND Eighth Avenue Line|Eighth Avenue Line]] ({{NYCS trains|Eighth south}}): from 207th Street, south roughly under [[Broadway (Manhattan)|Broadway]]; under [[Saint Nicholas Avenue (Manhattan)|Saint Nicholas Avenue]], [[Eighth Avenue (Manhattan)|Eighth Avenue]], Greenwich Avenue, [[Sixth Avenue (Manhattan)|Sixth Avenue]] (with a junction with the Sixth Avenue Line/Houston Street Line), Church Street, and [[Fulton Street (Manhattan)|Fulton Street]]; under the [[East River]] via the [[Cranberry Street Tunnel]] into Brooklyn, to the Fulton Street Line (parallel to the [[IRT Ninth Avenue Line]])
* [[IND Sixth Avenue Line|Sixth Avenue Line]] ({{NYCS trains|Sixth}}): from a split from the Eighth Avenue Line at 53rd Street, two blocks east to Sixth Avenue, then south under Sixth Avenue to a junction with the Eighth Avenue Line north of Houston Street, then east under Houston Street and south under Essex Street and Rutgers Street to the Rutgers Street Tunnel to Brooklyn – parallel to the IRT [[Sixth Avenue Elevated]]
* [[IND Queens Boulevard Line|Queens Boulevard Line]] ({{NYCS trains|Queens 53rd}}): from the 53rd Street Tunnel from Queens, west under 53rd Street past a junction with the Sixth Avenue Line to merge with the Eighth Avenue Line – partly parallel to the IRT [[Sixth Avenue Elevated]] connection to the IRT [[Ninth Avenue Elevated]] along 53rd Street<ref name="nycsubway.org"/>

===East River crossings===
* [[53rd Street Tunnel]] ({{NYCS trains|Queens 53rd}}) – along the Queens Boulevard Line
* [[Rutgers Street Tunnel]] ({{NYCS trains|Sixth Rutgers}}) – connecting the Sixth Avenue Line to the Culver Line
* [[Cranberry Street Tunnel]] ({{NYCS trains|Eighth Cranberry}}) – connecting the Eighth Avenue Line to the Fulton Street Line<ref name="nycsubway.org"/>

===Brooklyn and Queens===
* [[IND Queens Boulevard Line|Queens Boulevard Line]] ({{NYCS trains|Queens}}): from 169th Street, west under Hillside Avenue, Queens Boulevard, Broadway, Northern Boulevard and 44th Drive to the 53rd Street Tunnel to Manhattan
* [[IND Crosstown Line|Crosstown Line]] ({{NYCS trains|Crosstown}}): from the Queens Boulevard Line at Queens Plaza, south under Jackson Avenue, Manhattan Avenue, Union Avenue, Marcy Avenue and Lafayette Avenue, coming into the middle of the Fulton Street Line and connecting south into the Culver Line
* [[IND Culver Line|Culver Line]] (originally the Smith Street Line) ({{NYCS trains|Culver IND north}}): from the Rutgers Street Tunnel, south under Jay Street and Smith Street, coming to the surface and turning east over the [[Gowanus Canal]] at Ninth Street, then back underground, under Ninth Street, Prospect Park West, Prospect Avenue, Fort Hamilton Parkway and McDonald Avenue, ending at Church Avenue (later extended south along the BMT Culver Line)
* [[IND Fulton Street Line|Fulton Street Line]] ({{NYCS trains|Fulton}}): from [[Court Street (IND Fulton Street Line)|Court Street]] (now the New York Transit Museum) and the Cranberry Street Tunnel east under Fulton Street to Rockaway Avenue (later extended east along the BMT [[Liberty Avenue Elevated]]) – parallel to the BMT [[Fulton Street Elevated]]<ref name="nycsubway.org"/>

===Extensions after 1940===
The following extensions and connections were built after unification in 1940:
* [[IND Queens Boulevard Line|Queens Boulevard Line]] ({{NYCS trains|Queens Hillside}}): extended east to 179th Street
* [[IND Culver Line|Culver Line]] ({{NYCS trains|Culver IND south}}): extended south along the ex-BMT Culver Line
* [[60th Street Tunnel Connection]] ({{NYCS trains|60th Connection}}): connecting the BMT's [[60th Street Tunnel]] to the Queens Boulevard Line
* [[IND Fulton Street Line|Fulton Street Line]] ({{NYCS trains|Fulton east}}): extended east to and over the BMT [[Liberty Avenue Elevated]]
* [[IND Rockaway Line|Rockaway Line]] ({{NYCS trains|Rockaway}}): south from the Fulton Street Line east of [[Rockaway Boulevard (IND Fulton Street Line)|Rockaway Boulevard]]<ref name="nycsubway.org"/>
* [[Chrystie Street Connection]], connecting the Houston Street Line (Sixth Avenue Line) to the BMT lines over the [[Williamsburg Bridge]] ({{NYCS trains|Chrystie Williamsburg}}) and [[Manhattan Bridge]] ({{NYCS trains|Chrystie Manhattan}})
* [[Archer Avenue Line]] ({{NYCS trains|Archer IND}}): from the Queens Boulevard Line at Van Wyck Boulevard south and east to Jamaica Center
* [[IND 63rd Street Line|63rd Street Line]] ({{NYCS trains|63rd IND}}): connecting the Sixth Avenue Line and the Queens Boulevard Line through the [[63rd Street Tunnel]], and connecting to the [[BMT 63rd Street Line]]

The following extension is partially open:
* [[IND Second Avenue Line]] ({{NYCS trains|Second header}}): from [[96th Street (Second Avenue Subway)|96th Street]] to [[72nd Street (Second Avenue Subway)|72nd Street]], then connecting with the BMT 63rd Street Line<ref name="sas nydailynews">[http://www.nydailynews.com/new-york/mta-releases-avenue-subway-images-article-1.1506866 MTA releases Second Avenue subway images, says project on track] NY Daily News, November 5, 2013</ref>