Second Avenue Subway
E51029
The Second Avenue Subway is a New York City Subway line on Manhattan’s East Side, built to relieve congestion on the Lexington Avenue Line and long envisioned as a major north–south transit corridor.
All labels observed (11)
How this entity was disambiguated
This entity first appeared as the object of triple T386930 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Second Avenue Subway Context triple: [Upper East Side, traversedBy, Second Avenue Subway]
-
A.
Flushing Line
The Flushing Line is a New York City Subway service in Queens and Manhattan, best known today as the 7 train running between Flushing–Main Street and Hudson Yards.
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B.
Lexington Avenue Line
The Lexington Avenue Line is a major New York City Subway route in Manhattan that carries the 4, 5, and 6 trains and is one of the system’s busiest and most important north–south corridors.
-
C.
Lenox Avenue Line
The Lenox Avenue Line is a major New York City Subway route in Harlem, Manhattan, primarily served by IRT trains running beneath Lenox Avenue.
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D.
New Lots Line
The New Lots Line is a New York City Subway line in Brooklyn that serves the easternmost portion of the IRT system, terminating at New Lots Avenue.
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E.
Broadway–Seventh Avenue Line
The Broadway–Seventh Avenue Line is a major New York City Subway route in Manhattan and the Bronx, primarily served by the 1, 2, and 3 trains.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Second Avenue Subway Target entity description: The Second Avenue Subway is a New York City Subway line on Manhattan’s East Side, built to relieve congestion on the Lexington Avenue Line and long envisioned as a major north–south transit corridor.
-
A.
Flushing Line
The Flushing Line is a New York City Subway service in Queens and Manhattan, best known today as the 7 train running between Flushing–Main Street and Hudson Yards.
-
B.
Lexington Avenue Line
The Lexington Avenue Line is a major New York City Subway route in Manhattan that carries the 4, 5, and 6 trains and is one of the system’s busiest and most important north–south corridors.
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C.
Lenox Avenue Line
The Lenox Avenue Line is a major New York City Subway route in Harlem, Manhattan, primarily served by IRT trains running beneath Lenox Avenue.
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D.
New Lots Line
The New Lots Line is a New York City Subway line in Brooklyn that serves the easternmost portion of the IRT system, terminating at New Lots Avenue.
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E.
Broadway–Seventh Avenue Line
The Broadway–Seventh Avenue Line is a major New York City Subway route in Manhattan and the Bronx, primarily served by the 1, 2, and 3 trains.
- F. None of above. chosen
Statements (52)
| Predicate | Object |
|---|---|
| instanceOf |
New York City Subway line
ⓘ
infrastructure project ⓘ rapid transit line ⓘ |
| artProgram |
MTA Arts & Design installations
ⓘ
surface form:
MTA Arts & Design permanent installations
|
| borough | Manhattan ⓘ |
| connectsTo |
63rd Street–Lexington Avenue
ⓘ
BMT Broadway Line ⓘ IND Queens Boulevard Line ⓘ Lexington Avenue Line ⓘ |
| constructionMethod |
cut-and-cover
ⓘ
tunnel boring machine ⓘ |
| constructionStart | 2007 ⓘ |
| country | United States of America ⓘ |
| features |
ADA-accessible stations
ⓘ
air-conditioned stations ⓘ full-length mezzanines at some stations ⓘ platform screen doors provision-ready infrastructure ⓘ |
| fundingSource |
Metropolitan Transportation Authority capital program
ⓘ
U.S. state of New York ⓘ
surface form:
State of New York
United States government ⓘ
surface form:
federal government of the United States
|
| futurePhase |
Phase 2
ⓘ
Phase 3 ⓘ Phase 4 ⓘ |
| historyEvent |
funding crises in 1970s halted earlier work
ⓘ
multiple construction attempts in mid-20th century were started and abandoned ⓘ originally proposed in 1920s as part of IND Second System ⓘ |
| lineColorOnMap | turquoise ⓘ |
| lineDesignation | Second Avenue Line ⓘ |
| locatedIn |
Manhattan
ⓘ
New York City ⓘ New York ⓘ
surface form:
New York State
|
| notableStationArt |
72nd Street station artwork by Vik Muniz
ⓘ
86th Street station artwork by Chuck Close ⓘ 96th Street station artwork by Sarah Sze ⓘ |
| openingDate | 2017-01-01 ⓘ |
| operator |
Metropolitan Transportation Authority
ⓘ
New York City Transit Authority ⓘ |
| ownedBy | Metropolitan Transportation Authority ⓘ |
| phase | Phase 1 ⓘ |
| phase1IntermediateStation | 86th Street ⓘ |
| phase1TerminusNorth |
East 96th Street
ⓘ
surface form:
96th Street
|
| phase1TerminusSouth |
West 72nd Street
ⓘ
surface form:
72nd Street
|
| plannedExtensionDirection |
north to Harlem–125th Street
ⓘ
south to Lower Manhattan ⓘ |
| planningStart | 1920s ⓘ |
| purpose |
provide north–south transit on Manhattan’s East Side
ⓘ
relieve congestion on the Lexington Avenue Line ⓘ |
| relieves | Lexington Avenue Line crowding ⓘ |
| runsAlong | Second Avenue ⓘ |
| servicePattern | Q train operates via Second Avenue between 63rd Street and 96th Street ⓘ |
| status | partially completed ⓘ |
| usesServiceDesignation | Q ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Second Avenue Subway Description of subject: The Second Avenue Subway is a New York City Subway line on Manhattan’s East Side, built to relieve congestion on the Lexington Avenue Line and long envisioned as a major north–south transit corridor.
Referenced by (24)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Second Avenue Subway Phase 1
this entity surface form:
Second Avenue Subway Phase 1 Upper East Side stations
this entity surface form:
Second Avenue Subway (Manhattan segment)
Q train operates via Second Avenue between 63rd Street and 96th Street
→
partOf
→
Second Avenue Subway
ⓘ
Q train operates via Second Avenue between 63rd Street and 96th Street
→
partOfProject
→
Second Avenue Subway
ⓘ
this entity surface form:
Second Avenue Subway phase 1
this entity surface form:
Second Avenue Subway Phase 1 art program
this entity surface form:
Second Avenue Subway line
this entity surface form:
Second Avenue Subway Phase 1 art program
this entity surface form:
Second Avenue Subway Phase 1
this entity surface form:
Second Avenue Subway Phase 1
this entity surface form:
Second Avenue Subway Phase 2
this entity surface form:
Second Avenue Subway Phase 3
this entity surface form:
Second Avenue Subway Phase 4
this entity surface form:
Second Avenue Subway tunnel
subject surface form:
Q (New York City Subway service)
this entity surface form:
Second Avenue Subway Phase 1