MBTA Mattapan Line
E526945
The MBTA Mattapan Line is a light rail trolley service in the Boston area that operates historic streetcars between Ashmont Station and Mattapan, serving neighborhoods in Boston and Milton.
All labels observed (1)
| Label | Occurrences |
|---|---|
| MBTA Mattapan Line canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4729240 — 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 Line Context triple: [Mattapan, hasTransportation, MBTA Mattapan Line]
-
A.
MBTA Fairmount Line
The MBTA Fairmount Line is a commuter rail service in Boston, Massachusetts, connecting several neighborhoods in the city’s southern corridor to downtown.
-
B.
MBTA Lowell Line
The MBTA Lowell Line is a commuter rail service operated by the Massachusetts Bay Transportation Authority that runs between Boston’s North Station and Lowell, serving several communities in northern Massachusetts.
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C.
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.
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D.
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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E.
MBTA Needham Line
The MBTA Needham Line is a commuter rail route in the Greater Boston area that connects Boston’s South Station with the suburb of Needham, serving intermediate communities along the way.
- 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 Line Target entity description: The MBTA Mattapan Line is a light rail trolley service in the Boston area that operates historic streetcars between Ashmont Station and Mattapan, serving neighborhoods in Boston and Milton.
-
A.
MBTA Fairmount Line
The MBTA Fairmount Line is a commuter rail service in Boston, Massachusetts, connecting several neighborhoods in the city’s southern corridor to downtown.
-
B.
MBTA Lowell Line
The MBTA Lowell Line is a commuter rail service operated by the Massachusetts Bay Transportation Authority that runs between Boston’s North Station and Lowell, serving several communities in northern Massachusetts.
-
C.
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.
-
D.
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.
-
E.
MBTA Needham Line
The MBTA Needham Line is a commuter rail route in the Greater Boston area that connects Boston’s South Station with the suburb of Needham, serving intermediate communities along the way.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
heritage streetcar line
ⓘ
light rail line ⓘ trolley line ⓘ |
| colorOnSystemMap | red (as Red Line branch) ⓘ |
| connectsRiver | Neponset River corridor NERFINISHED ⓘ |
| connectsTo | Red Line at Ashmont station NERFINISHED ⓘ |
| electrification | overhead catenary ⓘ |
| fareIntegration | integrated with Red Line ⓘ |
| fareMedium |
CharlieCard
NERFINISHED
ⓘ
CharlieTicket NERFINISHED ⓘ |
| fareSystem | MBTA subway fare system ⓘ |
| hasFuturePlan | planned modernization and fleet replacement ⓘ |
| hasTransfer | Ashmont busway NERFINISHED ⓘ |
| heritageStatus | uses historic PCC streetcars ⓘ |
| lineLength | approximately 2.6 miles ⓘ |
| locatedIn |
Boston, Massachusetts
ⓘ
Milton, Massachusetts NERFINISHED ⓘ United States of America ⓘ
surface form:
United States
|
| numberOfStations | 8 ⓘ |
| numberOfTracks | single track with passing sidings ⓘ |
| openedAsCurrentService | 1929 ⓘ |
| operator |
MBTA
ⓘ
surface form:
Massachusetts Bay Transportation Authority
|
| originalOperator | Boston Elevated Railway NERFINISHED ⓘ |
| owner |
MBTA
ⓘ
surface form:
Massachusetts Bay Transportation Authority
|
| partOfNetwork | MBTA Red Line NERFINISHED ⓘ |
| powerSupply | 600 V DC overhead ⓘ |
| primaryFunction | urban public transit ⓘ |
| regionServed | Greater Boston ⓘ |
| rightOfWayType | mostly dedicated reservation ⓘ |
| rollingStock | PCC streetcar NERFINISHED ⓘ |
| servesMunicipality | Town of Milton NERFINISHED ⓘ |
| servesNeighborhood |
Dorchester
NERFINISHED
ⓘ
Mattapan NERFINISHED ⓘ |
| serviceType |
light rail
ⓘ
local transit ⓘ |
| station |
Ashmont
NERFINISHED
ⓘ
Butler NERFINISHED ⓘ Capen Street NERFINISHED ⓘ Cedar Grove NERFINISHED ⓘ Central Avenue NERFINISHED ⓘ Mattapan NERFINISHED ⓘ Milton NERFINISHED ⓘ Valley Road NERFINISHED ⓘ |
| successorOperator |
Massachusetts Bay Transportation Authority
NERFINISHED
ⓘ
Metropolitan Transit Authority (Boston) NERFINISHED ⓘ |
| terminus |
Ashmont station
NERFINISHED
ⓘ
Mattapan station NERFINISHED ⓘ |
| trackGauge | standard gauge ⓘ |
| usesRollingStockType | Presidents’ Conference Committee streetcar NERFINISHED ⓘ |
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 Line Description of subject: The MBTA Mattapan Line is a light rail trolley service in the Boston area that operates historic streetcars between Ashmont Station and Mattapan, serving neighborhoods in Boston and Milton.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.