Editing Independent Subway System (section)

==Line planning==
Many IND lines were designed to be parallel to existing IRT and BMT subway lines in order to compete with them.
* The [[IND Concourse Line]] is within one to three short blocks of the [[IRT Jerome Avenue Line]] for most of its length. It was also planned to replace the then-[[New York, Westchester and Boston Railway|NYW&B]]-owned [[IRT Dyre Avenue Line|line]] as well as the [[IRT White Plains Road Line]].
* The [[IND Eighth Avenue Line]] is within {{convert|0.25|mi|km}} of the [[IRT Broadway–Seventh Avenue Line]] and the [[IRT Lenox Avenue Line]] for most of its length. It was designed to replace the [[IRT Ninth Avenue Line]].
* The [[IND Sixth Avenue Line]] was designed to replace the [[IRT Sixth Avenue Line]].
* The [[IND Fulton Street Line]] is within {{convert|0.5|mi|km}} of the [[IRT Eastern Parkway Line]] and the [[IRT New Lots Line]] for most of its length in Brooklyn. It was designed to replace the [[BMT Fulton Street Line]].
* The [[IND Crosstown Line]] was designed to replace [[Rapid transit operations of the BRT and BMT|BMT streetcars]].
* The [[Second Avenue Subway]] is designed to be within 0.25 miles (0.40&nbsp;km) of the [[IRT Lexington Avenue Line]], and to replace the [[IRT Second Avenue Line]] and the [[IRT Third Avenue Line]].

Additionally, some never-built lines were designed to replace old elevated lines.
* The [[IRT Dyre Avenue Line]] and [[IRT Pelham Line]] were to be recaptured by the IND Second Avenue Line.
* The IND Utica Avenue Line and the [[Archer Avenue Lines|IND Archer Avenue Line]] were both designed to replace parts of the [[BMT Jamaica Line]]. The latter would also be planned to replace the [[Atlantic Branch]] of the Long Island Rail Road.<ref name="nycsubway.org"/>