Editing Independent Subway System (section)

===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>