Mattapan Trolley
E16691
The Mattapan Trolley is a historic light rail line in Boston that operates vintage PCC streetcars between Ashmont and Mattapan stations.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Mattapan Trolley canonical | 7 |
| MBTA Mattapan Trolley | 2 |
| Boston PCC streetcar | 1 |
| Mattapan trolley | 1 |
| Presidents’ Conference Committee streetcar | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T141761 — 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: Mattapan Trolley Context triple: [MBTA, hasRailLine, Mattapan Trolley]
-
A.
Portland Streetcar
Portland Streetcar is a modern urban streetcar transit system serving central Portland, Oregon, connecting key neighborhoods, employment centers, and educational institutions.
-
B.
Roosevelt Island Tramway
The Roosevelt Island Tramway is an aerial cable car system in New York City that connects Roosevelt Island to Manhattan, offering both public transit and scenic views of the skyline.
-
C.
MBTA Red Line
The MBTA Red Line is a major rapid transit line in the Boston metropolitan area that runs through key communities including Cambridge, connecting them to downtown Boston and other parts of the region.
-
D.
MBTA Green Line D branch
The MBTA Green Line D branch is a light rail line in the Boston metropolitan area that runs between downtown Boston and several western suburbs, including Newton and Riverside.
-
E.
Tompkins Consolidated Area Transit
Tompkins Consolidated Area Transit is the primary public bus system serving Ithaca and the surrounding Tompkins County region in New York.
- 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: Mattapan Trolley Target entity description: The Mattapan Trolley is a historic light rail line in Boston that operates vintage PCC streetcars between Ashmont and Mattapan stations.
-
A.
Portland Streetcar
Portland Streetcar is a modern urban streetcar transit system serving central Portland, Oregon, connecting key neighborhoods, employment centers, and educational institutions.
-
B.
Roosevelt Island Tramway
The Roosevelt Island Tramway is an aerial cable car system in New York City that connects Roosevelt Island to Manhattan, offering both public transit and scenic views of the skyline.
-
C.
MBTA Red Line
The MBTA Red Line is a major rapid transit line in the Boston metropolitan area that runs through key communities including Cambridge, connecting them to downtown Boston and other parts of the region.
-
D.
MBTA Green Line D branch
The MBTA Green Line D branch is a light rail line in the Boston metropolitan area that runs between downtown Boston and several western suburbs, including Newton and Riverside.
-
E.
Tompkins Consolidated Area Transit
Tompkins Consolidated Area Transit is the primary public bus system serving Ithaca and the surrounding Tompkins County region in New York.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
heritage streetcar line
ⓘ
light rail line ⓘ public transit line ⓘ |
| cityServed |
Boston
ⓘ
linked to:
Boston, Massachusetts
|
| connectsToMode |
MBTA bus network at Ashmont
ⓘ
linked to:
MBTA bus network
MBTA bus network at Mattapan ⓘ
linked to:
MBTA bus network
|
| connectsWith |
Ashmont–Braintree branch of the Red Line
ⓘ
linked to:
MBTA Ashmont Branch
|
| electrification | overhead line ⓘ |
| fareIntegration | integrated with MBTA subway fares ⓘ |
| fareSystem | MBTA fare system ⓘ |
| hasRouteNumber | Mattapan High-Speed Line ⓘ |
| heritageStatus | one of the last PCC-operated lines in the United States ⓘ |
| historicSignificance | operates vintage PCC streetcars in regular service ⓘ |
| lineLength | approximately 2.6 miles ⓘ |
| locatedIn |
Boston
ⓘ
linked to:
Boston, Massachusetts
Massachusetts ⓘ United States ⓘ
linked to:
United States of America
|
| neighborhoodServed |
Dorchester
ⓘ
Mattapan ⓘ |
| numberOfStations | 8 ⓘ |
| numberOfTracks | single track with passing sidings ⓘ |
| openingDate | 1940s ⓘ |
| operatedBy |
Massachusetts Bay Transportation Authority
ⓘ
linked to:
MBTA
|
| owner |
Massachusetts Bay Transportation Authority
ⓘ
linked to:
MBTA
|
| partOf |
MBTA rail network
ⓘ
linked to:
MBTA
|
| previousMode | streetcar line ⓘ |
| primaryPowerSource | electricity ⓘ |
| regionServed | Neponset River valley ⓘ |
| rollingStockType |
President’s Conference Committee streetcar
ⓘ
linked to:
PCC streetcar
|
| servicePattern | all-stop local service ⓘ |
| serviceType |
heritage streetcar
ⓘ
light rail ⓘ |
| shortName | Mattapan Line ⓘ |
| station |
Ashmont station
ⓘ
Butler station ⓘ Capen Street station ⓘ Cedar Grove station ⓘ
linked to:
Valley Road station
Central Avenue station ⓘ Mattapan station ⓘ
linked to:
Ashmont station
Milton station ⓘ Valley Road station ⓘ |
| system | MBTA Red Line ⓘ |
| terminus |
Ashmont station
ⓘ
Mattapan station ⓘ
linked to:
Ashmont station
|
| trackGauge | standard gauge ⓘ |
| usesInfrastructure | former New York, New Haven and Hartford Railroad right-of-way ⓘ |
| usesRollingStock | PCC streetcar ⓘ |
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: Mattapan Trolley Description of subject: The Mattapan Trolley is a historic light rail line in Boston that operates vintage PCC streetcars between Ashmont and Mattapan stations.
Referenced by (12)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Mattapan Trolley
linked to: Mattapan Trolley
linked to: Mattapan Trolley
linked to: Mattapan Trolley
linked to: Mattapan Trolley