D train
E15411
The D train is a major New York City Subway service that runs as an express route through Manhattan and the Bronx, connecting key neighborhoods across multiple boroughs.
All labels observed (3)
| Label | Occurrences |
|---|---|
| D train canonical | 54 |
| D train serves the station at all times | 3 |
| D train (current primary service) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T23950 — 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: D train Context triple: [New York City Subway, hasLine, D train]
-
A.
C train
The C train is a local service on the New York City Subway’s Eighth Avenue Line, running primarily between Upper Manhattan and Brooklyn.
-
B.
B train
The B train is a New York City Subway service that runs on the IND Sixth Avenue Line, providing weekday express service in Manhattan and Brooklyn.
-
C.
4 train
The 4 train is a New York City Subway service that runs along the Lexington Avenue Line in Manhattan, providing express service between the Bronx and Brooklyn.
-
D.
E train
The E train is a New York City Subway service that runs primarily along the IND Eighth Avenue Line, providing rapid transit between Queens and Manhattan.
-
E.
MARC Train
MARC Train is a commuter rail service operating in Maryland and the surrounding region, connecting cities such as Washington, D.C., Baltimore, and Martinsburg.
- 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: D train Target entity description: The D train is a major New York City Subway service that runs as an express route through Manhattan and the Bronx, connecting key neighborhoods across multiple boroughs.
-
A.
C train
The C train is a local service on the New York City Subway’s Eighth Avenue Line, running primarily between Upper Manhattan and Brooklyn.
-
B.
B train
The B train is a New York City Subway service that runs on the IND Sixth Avenue Line, providing weekday express service in Manhattan and Brooklyn.
-
C.
4 train
The 4 train is a New York City Subway service that runs along the Lexington Avenue Line in Manhattan, providing express service between the Bronx and Brooklyn.
-
D.
E train
The E train is a New York City Subway service that runs primarily along the IND Eighth Avenue Line, providing rapid transit between Queens and Manhattan.
-
E.
MARC Train
MARC Train is a commuter rail service operating in Maryland and the surrounding region, connecting cities such as Washington, D.C., Baltimore, and Martinsburg.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
New York City Subway service
ⓘ
rapid transit service ⓘ |
| boroughServed |
Brooklyn
ⓘ
Manhattan ⓘ The Bronx ⓘ |
| color | orange ⓘ |
| connectsBorough |
Brooklyn
ⓘ
Manhattan ⓘ The Bronx ⓘ |
| connectsNeighborhood |
Central Bronx
ⓘ
Downtown Brooklyn vicinity via connections ⓘ Harlem ⓘ Lower Manhattan vicinity via connections ⓘ Midtown Manhattan ⓘ South Bronx ⓘ Upper West Side ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| farePaymentMethod |
MetroCard
ⓘ
OMNY ⓘ |
| fareSystem |
Metropolitan Transportation Authority fare system
ⓘ
linked to:
MTA New York City Subway fare system
|
| fareZoneSystem | flat fare within New York City Subway ⓘ |
| hasServiceType |
express service
ⓘ
local service (on some segments and times) ⓘ |
| modeOfTransport | subway ⓘ |
| operatedBy |
New York City Transit Authority
ⓘ
linked to:
Metropolitan Transportation Authority
|
| operatesAllDay | yes ⓘ |
| operatesDays | daily ⓘ |
| owner | Metropolitan Transportation Authority ⓘ |
| partOf | New York City Subway ⓘ |
| poweredBy | third rail electricity ⓘ |
| publicTransportType | heavy rail ⓘ |
| region | Northeastern United States ⓘ |
| safetySystem |
automatic train stop (ATS) on some segments
ⓘ
wayside signals ⓘ |
| servesFunction |
commuter transport
ⓘ
interborough connection ⓘ |
| serviceArea | New York City ⓘ |
| servicePattern |
express in Manhattan
ⓘ
express in The Bronx ⓘ local and express in Brooklyn (varies by time) ⓘ |
| symbol | D ⓘ |
| system | IND Division ⓘ |
| trackGauge | standard gauge ⓘ |
| usesRollingStockType | B Division subway cars ⓘ |
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: D train Description of subject: The D train is a major New York City Subway service that runs as an express route through Manhattan and the Bronx, connecting key neighborhoods across multiple boroughs.
Referenced by (58)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
IND Sixth Avenue Line (nearby connection via passageways)
linked to: D train
subject linked to:
Tremont Avenue station on the IND Concourse Line
linked to: D train
subject linked to:
D Line
subject linked to:
Coney Island neighborhood