Pittsburgh Light Rail subway trunk
E872167
The Pittsburgh Light Rail subway trunk is the central underground segment of Pittsburgh’s light rail system that carries trains through the city’s downtown core.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Pittsburgh Light Rail downtown subway | 1 |
| Pittsburgh Light Rail subway trunk canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10416119 — 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: Pittsburgh Light Rail subway trunk Context triple: [Steel Plaza station, partOf, Pittsburgh Light Rail subway trunk]
-
A.
Pittsburgh Light Rail Red Line
The Pittsburgh Light Rail Red Line is a major light rail route in Pittsburgh, Pennsylvania, connecting downtown with several southern neighborhoods and suburbs.
-
B.
Pittsburgh Light Rail Blue Line
The Pittsburgh Light Rail Blue Line is a light rail service in Pittsburgh, Pennsylvania, that connects downtown with various southern suburbs as part of the Port Authority’s “T” system.
-
C.
Pittsburgh Light Rail Silver Line
The Pittsburgh Light Rail Silver Line is a light rail service in Pittsburgh, Pennsylvania, that operates as part of the city's "T" system, connecting downtown with surrounding neighborhoods and suburbs.
-
D.
Allegheny Station (Pittsburgh Light Rail)
Allegheny Station is a Pittsburgh Light Rail stop on the North Shore that serves major nearby destinations including Acrisure Stadium.
-
E.
Shaker Heights rapid transit line
The Shaker Heights rapid transit line is an electric light rail system serving the Cleveland, Ohio suburbs, known for its early 20th-century suburban planning and integration with the city’s transit network.
- 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: Pittsburgh Light Rail subway trunk Target entity description: The Pittsburgh Light Rail subway trunk is the central underground segment of Pittsburgh’s light rail system that carries trains through the city’s downtown core.
-
A.
Pittsburgh Light Rail Red Line
The Pittsburgh Light Rail Red Line is a major light rail route in Pittsburgh, Pennsylvania, connecting downtown with several southern neighborhoods and suburbs.
-
B.
Pittsburgh Light Rail Blue Line
The Pittsburgh Light Rail Blue Line is a light rail service in Pittsburgh, Pennsylvania, that connects downtown with various southern suburbs as part of the Port Authority’s “T” system.
-
C.
Pittsburgh Light Rail Silver Line
The Pittsburgh Light Rail Silver Line is a light rail service in Pittsburgh, Pennsylvania, that operates as part of the city's "T" system, connecting downtown with surrounding neighborhoods and suburbs.
-
D.
Allegheny Station (Pittsburgh Light Rail)
Allegheny Station is a Pittsburgh Light Rail stop on the North Shore that serves major nearby destinations including Acrisure Stadium.
-
E.
Shaker Heights rapid transit line
The Shaker Heights rapid transit line is an electric light rail system serving the Cleveland, Ohio suburbs, known for its early 20th-century suburban planning and integration with the city’s transit network.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
light rail subway trunk
ⓘ
railway infrastructure ⓘ underground rail line segment ⓘ |
| connects |
north side of Pittsburgh Light Rail system
ⓘ
south side of Pittsburgh Light Rail system ⓘ |
| electrification | overhead line ⓘ |
| forms | central segment of Pittsburgh Light Rail ⓘ |
| function | carries light rail trains through downtown core ⓘ |
| hasOwner | Pittsburgh Regional Transit ⓘ |
| hasStation |
First Avenue station
ⓘ
Gateway station ⓘ
linked to:
Gateway Station
Station Square station ⓘ Steel Plaza station ⓘ Wood Street station ⓘ
linked to:
Wood Street Station
|
| isUnderground | true ⓘ |
| locatedIn |
Downtown Pittsburgh
ⓘ
Pennsylvania ⓘ Pittsburgh ⓘ
linked to:
Pittsburgh, Pennsylvania
United States ⓘ
linked to:
United States of America
|
| modeOfTransport | light rail ⓘ |
| partOf |
Pittsburgh Light Rail
ⓘ
Pittsburgh Regional Transit light rail system ⓘ
linked to:
Pittsburgh Light Rail
|
| passesThrough | downtown tunnels ⓘ |
| primaryRole | downtown distribution for Pittsburgh Light Rail passengers ⓘ |
| serves |
Downtown Pittsburgh
ⓘ
Pittsburgh central business district ⓘ
linked to:
Downtown Pittsburgh
|
| systemOperator | Pittsburgh Regional Transit ⓘ |
| trackGauge | standard gauge ⓘ |
| usedBy |
Pittsburgh Light Rail trains
ⓘ
linked to:
Pittsburgh Light Rail LRVs
|
| usedFor | public transit ⓘ |
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: Pittsburgh Light Rail subway trunk Description of subject: The Pittsburgh Light Rail subway trunk is the central underground segment of Pittsburgh’s light rail system that carries trains through the city’s downtown core.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
Golden Triangle
linked to: Pittsburgh Light Rail subway trunk