Green Line central subway
E564602
The Green Line central subway is the underground trunk section of Boston’s MBTA Green Line where multiple surface branches converge and run through downtown.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Green Line central subway canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T6050647 — 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: Green Line central subway Context triple: [C Branch, usesInfrastructure, Green Line central subway]
-
A.
Green Line
The Green Line is one of the main rapid transit routes of the Dubai Metro, serving key districts along Dubai Creek and connecting important commercial and residential areas.
-
B.
Green Line
Green Line is a hybrid-oriented trim level of the Saturn Aura midsize sedan designed to offer improved fuel efficiency and lower emissions.
-
C.
Green Line
The Green Line is one of the main rapid transit corridors of the Chennai Metro system in Chennai, India, connecting key areas of the city via elevated and underground stations.
-
D.
Green Line
The Green Line is one of the light rail routes in Houston’s METRORail system, serving the city’s East End and connecting it to downtown.
-
E.
Green Line
The Green Line is one of Chicago's elevated rapid transit routes, running primarily along the city's West and South Sides as part of the Chicago "L" system.
- 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: Green Line central subway Target entity description: The Green Line central subway is the underground trunk section of Boston’s MBTA Green Line where multiple surface branches converge and run through downtown.
-
A.
Green Line
The Green Line is one of the main rapid transit routes of the Dubai Metro, serving key districts along Dubai Creek and connecting important commercial and residential areas.
-
B.
Green Line
Green Line is a hybrid-oriented trim level of the Saturn Aura midsize sedan designed to offer improved fuel efficiency and lower emissions.
-
C.
Green Line
The Green Line is one of the main rapid transit corridors of the Chennai Metro system in Chennai, India, connecting key areas of the city via elevated and underground stations.
-
D.
Green Line
The Green Line is one of the light rail routes in Houston’s METRORail system, serving the city’s East End and connecting it to downtown.
-
E.
Green Line
The Green Line is one of Chicago's elevated rapid transit routes, running primarily along the city's West and South Sides as part of the Chicago "L" system.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
light rail tunnel
ⓘ
public transit infrastructure ⓘ |
| connectsArea |
Back Bay
ⓘ
Downtown Boston ⓘ North Station area ⓘ West End ⓘ |
| connectsBranches | surface Green Line branches to downtown core ⓘ |
| electrification | overhead catenary ⓘ |
| fareSystem | MBTA subway fare system ⓘ |
| function | trunk corridor for converging Green Line branches ⓘ |
| hasHistoricalPrecursor | Tremont Street subway ⓘ |
| hasPlatformType | high-level platforms at most stations ⓘ |
| hasRightOfWay | exclusive ⓘ |
| hasSignageStandard |
MBTA rapid transit signage
ⓘ
linked to:
MBTA standard signage
|
| hasStation |
Arlington
ⓘ
Boylston ⓘ Copley ⓘ Government Center ⓘ
linked to:
Government Center area
Haymarket ⓘ Hynes Convention Center ⓘ Kenmore ⓘ North Station ⓘ Park Street ⓘ |
| hasTrackGauge | standard gauge ⓘ |
| interchangeWith |
MBTA Blue Line at Government Center
ⓘ
MBTA Orange Line at Haymarket ⓘ MBTA Orange Line at North Station ⓘ MBTA Red Line at Park Street ⓘ |
| isBusiestSectionOf | MBTA Green Line ⓘ |
| isGradeSeparated | true ⓘ |
| isPartOfNetwork |
MBTA rapid transit system
ⓘ
linked to:
MBTA
|
| isUnderground | true ⓘ |
| locatedIn |
Boston
ⓘ
linked to:
Boston, Massachusetts
Massachusetts ⓘ United States ⓘ
linked to:
United States of America
|
| openedForService | 1897 ⓘ |
| operator |
Massachusetts Bay Transportation Authority
ⓘ
linked to:
MBTA
|
| owner |
Massachusetts Bay Transportation Authority
ⓘ
linked to:
MBTA
|
| partOf | MBTA Green Line ⓘ |
| primaryPurpose | to carry Green Line trains through downtown Boston ⓘ |
| safetySystem | signalized light rail control ⓘ |
| servesLine |
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 ⓘ |
| 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: Green Line central subway Description of subject: The Green Line central subway is the underground trunk section of Boston’s MBTA Green Line where multiple surface branches converge and run through downtown.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.