MBTA Green Line main line
E639345
The MBTA Green Line main line is the core light rail trunk of Boston’s Green Line system, running through central Boston and connecting multiple branches that serve surrounding neighborhoods and suburbs.
All labels observed (2)
| Label | Occurrences |
|---|---|
| MBTA Green Line main line canonical | 1 |
| MBTA Green Line trunk | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6201306 — 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 Green Line main line Context triple: [Union Square Branch, connectsWith, MBTA Green Line main line]
-
A.
MBTA Green Line B branch
The MBTA Green Line B branch is a light rail service in Boston that runs along Commonwealth Avenue, primarily serving Boston University and the Allston–Brighton neighborhoods.
-
B.
MBTA Green Line C branch
The MBTA Green Line C branch is a light rail service in Boston and Brookline that runs primarily along Beacon Street, connecting Cleveland Circle to downtown Boston.
-
C.
MBTA Green Line E branch
The MBTA Green Line E branch is a light rail line in Boston that runs from downtown through the Back Bay and Longwood Medical Area to Heath Street, serving major hospitals, universities, and residential neighborhoods.
-
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 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.
- 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 Green Line main line Target entity description: The MBTA Green Line main line is the core light rail trunk of Boston’s Green Line system, running through central Boston and connecting multiple branches that serve surrounding neighborhoods and suburbs.
-
A.
MBTA Green Line B branch
The MBTA Green Line B branch is a light rail service in Boston that runs along Commonwealth Avenue, primarily serving Boston University and the Allston–Brighton neighborhoods.
-
B.
MBTA Green Line C branch
The MBTA Green Line C branch is a light rail service in Boston and Brookline that runs primarily along Beacon Street, connecting Cleveland Circle to downtown Boston.
-
C.
MBTA Green Line E branch
The MBTA Green Line E branch is a light rail line in Boston that runs from downtown through the Back Bay and Longwood Medical Area to Heath Street, serving major hospitals, universities, and residential neighborhoods.
-
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 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.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
light rail line
ⓘ
railway line ⓘ |
| connectsBranch |
Green Line B branch
ⓘ
Green Line C branch ⓘ
linked to:
Green Line C Branch
Green Line D branch ⓘ
linked to:
MBTA Green Line D branch
Green Line E branch ⓘ |
| connectsNeighborhood |
Allston
ⓘ
Back Bay ⓘ Brookline ⓘ Downtown Boston ⓘ Fenway–Kenmore ⓘ Longwood Medical Area ⓘ Mission Hill ⓘ |
| connectsTo |
Boston subway network
ⓘ
MBTA Blue Line ⓘ MBTA Commuter Rail ⓘ
linked to:
MBTA Commuter Rail network
MBTA Orange Line ⓘ MBTA Red Line ⓘ |
| electrification | overhead catenary ⓘ |
| fareSystem |
MBTA fare system
ⓘ
linked to:
MBTA fare structure
|
| gauge | standard gauge ⓘ |
| hasAccessibility | accessible stations on most of the line ⓘ |
| hasColor | green ⓘ |
| hasOwner |
Massachusetts Bay Transportation Authority
ⓘ
linked to:
MBTA
|
| hasRightOfWayType | mixed reserved and street-running ⓘ |
| hasServiceType |
frequent service
ⓘ
local service ⓘ |
| hasTicketing | proof-of-payment on some segments ⓘ |
| isCoreSegmentOf |
Boston Green Line network
ⓘ
linked to:
MBTA Green Line
|
| isPublicTransportRoute | yes ⓘ |
| isTrunkFor |
MBTA Green Line branches
ⓘ
linked to:
MBTA Green Line
|
| isUrbanRail | true ⓘ |
| locatedIn |
Massachusetts
ⓘ
United States ⓘ
linked to:
United States of America
|
| mode | light rail ⓘ |
| operator |
Massachusetts Bay Transportation Authority
ⓘ
linked to:
MBTA
|
| partOf | MBTA Green Line ⓘ |
| primaryFunction | urban transit corridor ⓘ |
| runsThrough | central Boston ⓘ |
| serves | Boston ⓘ |
| servesArea |
Boston metropolitan area
ⓘ
linked to:
Greater Boston
|
| system | MBTA ⓘ |
| transports | passengers ⓘ |
| usesRollingStockType | light rail vehicles ⓘ |
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 Green Line main line Description of subject: The MBTA Green Line main line is the core light rail trunk of Boston’s Green Line system, running through central Boston and connecting multiple branches that serve surrounding neighborhoods and suburbs.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: MBTA Green Line main line