LIRR Port Jefferson Branch
E465045
The LIRR Port Jefferson Branch is a Long Island Rail Road commuter rail line in New York that runs from Hicksville through northern Long Island to the village of Port Jefferson.
All labels observed (4)
| Label | Occurrences |
|---|---|
| LIRR Port Jefferson Branch canonical | 6 |
| LIRR Port Jefferson Branch trains | 2 |
| LIRR Port Jefferson Branch (electrified portion) | 1 |
| LIRR Port Jefferson Branch (via Main Line) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4592720 — 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: LIRR Port Jefferson Branch Context triple: [Hicksville station, railwayLine, LIRR Port Jefferson Branch]
-
A.
LIRR Hempstead Branch
The LIRR Hempstead Branch is a Long Island Rail Road commuter rail line in New York that runs between Hempstead and major hubs in Queens and Manhattan.
-
B.
LIRR Far Rockaway Branch
The LIRR Far Rockaway Branch is a commuter rail line of the Long Island Rail Road that runs between Far Rockaway in Queens and Jamaica, providing service to southeastern Queens and connections to Manhattan.
-
C.
LIRR Babylon Branch
The LIRR Babylon Branch is a major electrified commuter rail line on the Long Island Rail Road that runs from Jamaica in Queens through Nassau County to Babylon in Suffolk County.
-
D.
LIRR Oyster Bay Branch
The LIRR Oyster Bay Branch is a Long Island Rail Road commuter rail line in New York that runs between Oyster Bay and Jamaica, serving communities on the North Shore of Long Island.
-
E.
LIRR Montauk Branch
The LIRR Montauk Branch is a Long Island Rail Road line that runs from Jamaica in Queens through Long Island’s South Shore communities to Montauk at the island’s eastern tip.
- 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: LIRR Port Jefferson Branch Target entity description: The LIRR Port Jefferson Branch is a Long Island Rail Road commuter rail line in New York that runs from Hicksville through northern Long Island to the village of Port Jefferson.
-
A.
LIRR Hempstead Branch
The LIRR Hempstead Branch is a Long Island Rail Road commuter rail line in New York that runs between Hempstead and major hubs in Queens and Manhattan.
-
B.
LIRR Far Rockaway Branch
The LIRR Far Rockaway Branch is a commuter rail line of the Long Island Rail Road that runs between Far Rockaway in Queens and Jamaica, providing service to southeastern Queens and connections to Manhattan.
-
C.
LIRR Babylon Branch
The LIRR Babylon Branch is a major electrified commuter rail line on the Long Island Rail Road that runs from Jamaica in Queens through Nassau County to Babylon in Suffolk County.
-
D.
LIRR Oyster Bay Branch
The LIRR Oyster Bay Branch is a Long Island Rail Road commuter rail line in New York that runs between Oyster Bay and Jamaica, serving communities on the North Shore of Long Island.
-
E.
LIRR Montauk Branch
The LIRR Montauk Branch is a Long Island Rail Road line that runs from Jamaica in Queens through Long Island’s South Shore communities to Montauk at the island’s eastern tip.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
Long Island Rail Road branch
ⓘ
commuter rail line ⓘ |
| connectsAt |
Hicksville
ⓘ
linked to:
Hicksville, New York
|
| connectsToTerminal |
Grand Central Madison (via Main Line)
ⓘ
linked to:
Grand Central Madison
Penn Station (via Main Line) ⓘ
linked to:
Pennsylvania Station
|
| connectsUrbanArea | New York metropolitan area ⓘ |
| connectsWith |
LIRR Main Line
ⓘ
linked to:
Long Island Rail Road Main Line
|
| country |
United States
ⓘ
linked to:
United States of America
|
| electrification | third rail electrification to Huntington ⓘ |
| electrificationStatus | partially electrified ⓘ |
| endPoint |
Port Jefferson
ⓘ
linked to:
Port Jefferson, New York
|
| hasAbbreviation |
PJ Branch
ⓘ
Port Jeff Branch ⓘ |
| hasLevel | surface alignment ⓘ |
| hasStation |
Cold Spring Harbor
ⓘ
linked to:
Cold Spring Harbor, New York
Greenlawn ⓘ Hicksville ⓘ
linked to:
Hicksville, New York
Huntington ⓘ Kings Park ⓘ
linked to:
Kings Park, New York
Northport ⓘ Port Jefferson ⓘ
linked to:
Port Jefferson, New York
Smithtown ⓘ
linked to:
Smithtown, New York
St. James ⓘ Stony Brook ⓘ Syosset ⓘ |
| lineNumber | Port Jefferson Branch ⓘ |
| locatedIn |
Long Island
ⓘ
New York State ⓘ |
| openedBy | Long Island Rail Road ⓘ |
| operator | Long Island Rail Road ⓘ |
| owner | Metropolitan Transportation Authority ⓘ |
| ownerType | public transit authority ⓘ |
| partOf |
Long Island Rail Road network
ⓘ
linked to:
Long Island Rail Road
|
| primaryRollingStock |
diesel locomotives with coaches
ⓘ
electric multiple units ⓘ |
| primaryUse | commuter service to New York City ⓘ |
| railSystem |
North American railroad network
ⓘ
linked to:
North American rail network
|
| regionServed |
Nassau County
ⓘ
linked to:
Nassau County, New York
Suffolk County ⓘ
linked to:
Suffolk County, New York
|
| routeDirection | west–east ⓘ |
| serves |
northern Long Island communities
ⓘ
village of Port Jefferson ⓘ
linked to:
Port Jefferson, New York
|
| serviceType | commuter rail ⓘ |
| startPoint |
Hicksville
ⓘ
linked to:
Hicksville, New York
|
| terminus |
Hicksville
ⓘ
linked to:
Hicksville, New York
Port Jefferson ⓘ
linked to:
Port Jefferson, New York
|
| trackConfiguration |
double track in western portion
ⓘ
single track in eastern portion ⓘ |
| usesTrackGauge | standard gauge ⓘ |
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: LIRR Port Jefferson Branch Description of subject: The LIRR Port Jefferson Branch is a Long Island Rail Road commuter rail line in New York that runs from Hicksville through northern Long Island to the village of Port Jefferson.
Referenced by (10)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: LIRR Port Jefferson Branch
linked to: LIRR Port Jefferson Branch
subject linked to:
Northport station on the Long Island Rail Road
linked to: LIRR Port Jefferson Branch
subject linked to:
FP
linked to: LIRR Port Jefferson Branch