MBTA Mattapan High-Speed Line
E81387
The MBTA Mattapan High-Speed Line is a light rail trolley service in the Boston area that operates historic PCC streetcars between Ashmont Station in Dorchester and Mattapan, serving communities including Milton, Massachusetts.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Ashmont–Mattapan High-Speed Line | 2 |
| MBTA Mattapan High-Speed Line canonical | 1 |
| Mattapan High-Speed Line | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T386607 — 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: MBTA Mattapan High-Speed Line Context triple: [Milton, Massachusetts, hasTransportation, MBTA Mattapan High-Speed Line]
-
A.
MBTA Silver Line
The MBTA Silver Line is a bus rapid transit service in Boston that operates in dedicated lanes and tunnels, linking key neighborhoods, Logan Airport, and South Station.
-
B.
MBTA Fitchburg Line
The MBTA Fitchburg Line is a commuter rail route in the Greater Boston area that runs between Boston and Fitchburg, serving numerous suburban communities along the way.
-
C.
MBTA Blue Line
The MBTA Blue Line is a rapid transit line in the Boston metropolitan area that runs primarily along the city’s northeastern corridor, connecting downtown Boston with East Boston, Logan Airport, and Revere.
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D.
MBTA Orange Line
The MBTA Orange Line is a rapid transit line in the Boston metropolitan area that runs roughly north–south, connecting neighborhoods such as Jamaica Plain, Downtown Boston, and Malden.
-
E.
MBTA Ashmont Branch
The MBTA Ashmont Branch is a rapid transit line of Boston’s Red Line that runs from JFK/UMass station through Dorchester to Ashmont, serving several southern neighborhoods of the city.
- 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: MBTA Mattapan High-Speed Line Target entity description: The MBTA Mattapan High-Speed Line is a light rail trolley service in the Boston area that operates historic PCC streetcars between Ashmont Station in Dorchester and Mattapan, serving communities including Milton, Massachusetts.
-
A.
MBTA Silver Line
The MBTA Silver Line is a bus rapid transit service in Boston that operates in dedicated lanes and tunnels, linking key neighborhoods, Logan Airport, and South Station.
-
B.
MBTA Fitchburg Line
The MBTA Fitchburg Line is a commuter rail route in the Greater Boston area that runs between Boston and Fitchburg, serving numerous suburban communities along the way.
-
C.
MBTA Blue Line
The MBTA Blue Line is a rapid transit line in the Boston metropolitan area that runs primarily along the city’s northeastern corridor, connecting downtown Boston with East Boston, Logan Airport, and Revere.
-
D.
MBTA Orange Line
The MBTA Orange Line is a rapid transit line in the Boston metropolitan area that runs roughly north–south, connecting neighborhoods such as Jamaica Plain, Downtown Boston, and Malden.
-
E.
MBTA Ashmont Branch
The MBTA Ashmont Branch is a rapid transit line of Boston’s Red Line that runs from JFK/UMass station through Dorchester to Ashmont, serving several southern neighborhoods of the city.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
heritage streetcar line
ⓘ
light rail line ⓘ trolley line ⓘ |
| alsoKnownAs |
Mattapan Line
ⓘ
Mattapan Trolley ⓘ |
| colorOnSystemMap | red ⓘ |
| connectedNetwork |
MBTA
ⓘ
surface form:
MBTA transit network
|
| connectionStation | Ashmont station ⓘ |
| connectsWith | MBTA Red Line ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| depot | Mattapan yard ⓘ |
| electrification | overhead line ⓘ |
| fareIntegration | integrated with MBTA subway and bus fares ⓘ |
| fareSystem | MBTA subway fare system ⓘ |
| hasStation |
Ashmont station
ⓘ
Butler station ⓘ Capen Street station ⓘ Cedar Grove station ⓘ Central Avenue station ⓘ Mattapan station ⓘ Milton station ⓘ Valley Road station ⓘ |
| heritageStatus | operates historic PCC cars in regular service ⓘ |
| lineLength | approximately 2.6 miles ⓘ |
| locatedIn |
Greater Boston
ⓘ
Massachusetts ⓘ |
| numberOfTracks | single track with passing sidings ⓘ |
| openingDate | 1929 ⓘ |
| operator |
MBTA
ⓘ
surface form:
Massachusetts Bay Transportation Authority
|
| owner |
MBTA
ⓘ
surface form:
Massachusetts Bay Transportation Authority
|
| partOf |
Boston subway
ⓘ
surface form:
MBTA subway system
|
| primaryPropulsion | electric ⓘ |
| regionServed |
Greater Boston
ⓘ
surface form:
Boston metropolitan area
|
| rightOfWayType | mostly dedicated right-of-way ⓘ |
| rollingStockType | historic streetcars ⓘ |
| safetySystem | wayside signals ⓘ |
| serves |
Dorchester
ⓘ
Mattapan ⓘ Milton, Massachusetts NERFINISHED ⓘ |
| servicePattern | all-stop local service ⓘ |
| serviceType |
light rail
ⓘ
shuttle service ⓘ |
| terminus |
Ashmont station
ⓘ
Mattapan station ⓘ |
| trackGauge | standard gauge ⓘ |
| 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: MBTA Mattapan High-Speed Line Description of subject: The MBTA Mattapan High-Speed Line is a light rail trolley service in the Boston area that operates historic PCC streetcars between Ashmont Station in Dorchester and Mattapan, serving communities including Milton, Massachusetts.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Milton, Massachusetts
this entity surface form:
Ashmont–Mattapan High-Speed Line
this entity surface form:
Ashmont–Mattapan High-Speed Line
this entity surface form:
Mattapan High-Speed Line