IND Sixth Avenue Line
New York City Subway line in the USA
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 to Brooklyn. The B, D, F, and M trains, which use the Sixth Avenue Line through Midtown Manhattan, are colored orange. The B and D trains use the express tracks, while the F, <F> and M trains use the local tracks.
The Sixth Avenue Line, constructed in stages during the 1930s, was the last trunk line built by the Independent Subway System (IND) before it was incorporated into the modern-day New York City Subway. It was more difficult to build than other subway trunk lines in New York City because construction had to proceed around, over, and under existing tunnels and elevated structures. The Sixth Avenue Line replaced the Interborough Rapid Transit Company (IRT)'s Sixth Avenue elevated, which closed in 1939. The first section of the line opened in 1936 from West Fourth Street to East Broadway with service provided by Eighth Avenue Line trains. This section was initially referred to as the Houston-Essex Street Route. The Sixth Avenue subway was completed in 1940, providing service north of West Fourth Street, connecting to the Queens Boulevard Line and the Eighth Avenue Line.
Begin with the source’s own compact description: “IND Sixth Avenue Line” is new York City Subway line in the USA. The dossier treats that line as a proposition to test through Sixth, Avenue and Line, not as a finished interpretation.
Why this record matters
The phrase “new York City Subway line in the USA” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
The strongest evidence will usually combine a dated visual record with documents produced by the authority responsible for the place. The source revision retrieved here is dated Jun 5, 2026. The linked authority identifier is Q2982124. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1939, 1936 and 1940.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “IND Sixth Avenue Line”, its source revision and the description used here.
- Expand the search: follow IND Sixth Avenue Line primary sources, IND Sixth Avenue Line archive and Sixth research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “IND Sixth Avenue Line”?
- Which authority defined the place, boundary or structure at the relevant date?
- What physical evidence or contemporary plan supports the description?
Search terms from this dossier
This entry incorporates text from “IND Sixth Avenue Line” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.