4 train
E11246
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.
All labels observed (3)
| Label | Occurrences |
|---|---|
| 4 train canonical | 29 |
| 4 train (part-time, rush-hour express in the Bronx) | 1 |
| 4 train serves the station at all times | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T23942 — 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: 4 train Context triple: [New York City Subway, hasLine, 4 train]
-
A.
1 train
The 1 train is a New York City Subway service that runs along the Broadway–Seventh Avenue Line, providing local service between the Bronx and lower Manhattan.
-
B.
2 train
The 2 train is a New York City Subway service that runs as a numbered, typically express route on the IRT lines, connecting the Bronx, Manhattan, and Brooklyn.
-
C.
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.
-
D.
AeroTrain
AeroTrain is an automated underground people mover system that transports passengers between terminals at Washington Dulles International Airport.
-
E.
Congressional Limited Express
The Congressional Limited Express was a premier Pennsylvania Railroad passenger train that provided fast, luxurious service between New York City and Washington, D.C.
- 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: 4 train Target entity description: 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.
-
A.
1 train
The 1 train is a New York City Subway service that runs along the Broadway–Seventh Avenue Line, providing local service between the Bronx and lower Manhattan.
-
B.
2 train
The 2 train is a New York City Subway service that runs as a numbered, typically express route on the IRT lines, connecting the Bronx, Manhattan, and Brooklyn.
-
C.
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.
-
D.
AeroTrain
AeroTrain is an automated underground people mover system that transports passengers between terminals at Washington Dulles International Airport.
-
E.
Congressional Limited Express
The Congressional Limited Express was a premier Pennsylvania Railroad passenger train that provided fast, luxurious service between New York City and Washington, D.C.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
New York City Subway service
ⓘ
rapid transit service ⓘ |
| boroughServed |
Brooklyn
ⓘ
Manhattan ⓘ The Bronx ⓘ |
| city | New York City ⓘ |
| connectsWith |
2 train
ⓘ
3 train ⓘ 5 train ⓘ 6 train ⓘ BMT and IND services at transfer stations ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| division | IRT Division ⓘ |
| electrification | 600 V DC third rail ⓘ |
| fareSystem | Metropolitan Transportation Authority fare system ⓘ |
| gauge | standard gauge ⓘ |
| lineUsed |
IRT Eastern Parkway Line
ⓘ
linked to:
Eastern Parkway Line
IRT Jerome Avenue Line ⓘ
linked to:
Jerome Avenue Line
IRT Lexington Avenue Line ⓘ
linked to:
Lexington Avenue Line
|
| mapMarker | green circle with white 4 ⓘ |
| notableBronxStations |
149th Street–Grand Concourse
ⓘ
Fordham Road ⓘ Mosholu Parkway ⓘ Woodlawn ⓘ |
| notableBrooklynStations |
Atlantic Avenue–Barclays Center
ⓘ
linked to:
Atlantic Avenue–Barclays Center station
Crown Heights–Utica Avenue ⓘ Franklin Avenue–Medgar Evers College ⓘ Nevins Street ⓘ |
| notableManhattanStations |
125th Street
ⓘ
14th Street–Union Square ⓘ 59th Street–Lexington Avenue ⓘ 86th Street ⓘ Brooklyn Bridge–City Hall ⓘ
linked to:
Brooklyn Bridge
Grand Central–42nd Street ⓘ
linked to:
Grand Central–42nd Street station
|
| operator |
New York City Transit Authority
ⓘ
linked to:
Metropolitan Transportation Authority
|
| ownedBy | Metropolitan Transportation Authority ⓘ |
| primaryManhattanCorridor | Lexington Avenue ⓘ |
| serviceAreaDescription | connects the Bronx, Manhattan, and Brooklyn via the Lexington Avenue corridor ⓘ |
| serviceFrequency | 24-hour service ⓘ |
| serviceLetterOrNumber | 4 ⓘ |
| servicePattern |
express in Brooklyn
ⓘ
express in Manhattan ⓘ local and express in the Bronx (varies by time) ⓘ |
| serviceType | trunk express on Lexington Avenue Line ⓘ |
| symbolColor | dark green ⓘ |
| system | New York City Subway ⓘ |
| usesRollingStock | IRT A 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: 4 train Description of subject: 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.
Referenced by (31)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: 4 train
linked to: 4 train
subject linked to:
Uptown
subject linked to:
167th Street station on the IRT Jerome Avenue Line
subject linked to:
Spring Street station