Green Line
E46364
The Green Line is a light rail service in the Boston metropolitan area operated by the Massachusetts Bay Transportation Authority (MBTA), known for serving key downtown and surrounding neighborhoods.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Green Line canonical | 13 |
| Green Line (MBTA) | 1 |
| Green Line C branch | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T141760 — 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 Context triple: [MBTA, hasRailLine, Green Line]
-
A.
Green Line
The Green Line is one of the color-coded rapid transit routes in the Washington Metro system, serving key neighborhoods in Washington, D.C. and parts of Maryland.
-
B.
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.
-
C.
MAX Green Line
MAX Green Line is a light rail service in the Portland, Oregon metropolitan area that connects downtown Portland with Clackamas Town Center as part of TriMet’s MAX Light Rail system.
-
D.
Red Line
The Red Line is a major rapid transit route in Chicago that runs north–south through the city, serving as one of the busiest lines in its subway and elevated rail system.
-
E.
Red Line
The Red Line is a major rapid transit route in the Boston metropolitan area, operated by the MBTA and running primarily north–south through key neighborhoods and suburbs.
- 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 Target entity description: The Green Line is a light rail service in the Boston metropolitan area operated by the Massachusetts Bay Transportation Authority (MBTA), known for serving key downtown and surrounding neighborhoods.
-
A.
Green Line
The Green Line is one of the color-coded rapid transit routes in the Washington Metro system, serving key neighborhoods in Washington, D.C. and parts of Maryland.
-
B.
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.
-
C.
MAX Green Line
MAX Green Line is a light rail service in the Portland, Oregon metropolitan area that connects downtown Portland with Clackamas Town Center as part of TriMet’s MAX Light Rail system.
-
D.
Red Line
The Red Line is a major rapid transit route in Chicago that runs north–south through the city, serving as one of the busiest lines in its subway and elevated rail system.
-
E.
Red Line
The Red Line is a major rapid transit route in the Boston metropolitan area, operated by the MBTA and running primarily north–south through key neighborhoods and suburbs.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
light rail line
ⓘ
public transit service ⓘ |
| centralHub |
Boylston station
ⓘ
Copley station ⓘ Government Center station ⓘ Park Street station ⓘ |
| colorDesignation | green ⓘ |
| connectsWith |
Blue Line (MBTA)
ⓘ
linked to:
MBTA Blue Line
MBTA Commuter Rail ⓘ
linked to:
MBTA Commuter Rail network
MBTA bus network ⓘ Orange Line (MBTA) ⓘ
linked to:
MBTA Orange Line
Red Line (MBTA) ⓘ
linked to:
MBTA Red Line
|
| fareSystem | MBTA CharlieCard ⓘ |
| hasBranch |
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 ⓘ Green Line Medford/Tufts branch ⓘ Green Line Union Square branch ⓘ |
| hasFeature |
exclusive right-of-way segments
ⓘ
street-running segments ⓘ |
| locatedIn |
Boston metropolitan area
ⓘ
linked to:
Greater Boston
Commonwealth of Massachusetts ⓘ
linked to:
Massachusetts
United States ⓘ
linked to:
United States of America
|
| notableFor |
being one of the oldest urban rail corridors in the United States
ⓘ
serving key downtown Boston neighborhoods ⓘ |
| openedAsRailPredecessor | late 19th century streetcar lines in Boston ⓘ |
| operator |
Massachusetts Bay Transportation Authority
ⓘ
linked to:
MBTA
|
| partOf |
Greater Boston public transportation network
ⓘ
linked to:
MBTA Commuter Rail network
|
| poweredBy | electricity ⓘ |
| rollingStockType | light rail vehicles ⓘ |
| servesArea |
Allston
ⓘ
Back Bay ⓘ Brighton ⓘ Brookline ⓘ Cambridge (via Lechmere area connection) ⓘ Downtown Boston ⓘ Fenway–Kenmore ⓘ Medford ⓘ
linked to:
Medford, Massachusetts
Somerville ⓘ
linked to:
Somerville, Massachusetts
|
| sharesTunnelWith |
MBTA Orange Line (at North Station complex)
ⓘ
linked to:
MBTA Orange Line
|
| system |
MBTA subway
ⓘ
linked to:
Boston subway
|
| terminus |
Boston College station
ⓘ
Cleveland Circle station ⓘ Heath Street station ⓘ Medford/Tufts station ⓘ Riverside station ⓘ Union Square station (Somerville) ⓘ |
| transitType | light rail ⓘ |
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 Description of subject: The Green Line is a light rail service in the Boston metropolitan area operated by the Massachusetts Bay Transportation Authority (MBTA), known for serving key downtown and surrounding neighborhoods.
Referenced by (15)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Green Line
linked to: Green Line