Green Line Union Square branch
E381136
The Green Line Union Square branch is a light rail extension of Boston’s MBTA Green Line that serves the Union Square area of Somerville, Massachusetts.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Green Line Union Square Branch | 2 |
| Green Line Union Square branch canonical | 1 |
| Union Square Branch of the Green Line | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2383525 — 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 Union Square branch Context triple: [Green Line (MBTA), hasBranch, Green Line Union Square branch]
-
A.
Green Line B branch
The Green Line B branch is a light rail service of Boston's MBTA Green Line that runs along Commonwealth Avenue, primarily serving Boston University and the Allston–Brighton neighborhoods.
-
B.
Red Line Braintree Branch
The Red Line Braintree Branch is a southern extension of Boston's MBTA Red Line rapid transit system that serves communities between Quincy and Braintree.
-
C.
Green Line E branch
The Green Line E branch is a light rail service of Boston's MBTA Green Line that runs from downtown through the Back Bay and Longwood Medical Area to Heath Street in Jamaica Plain.
-
D.
Green Line C Branch
The Green Line C Branch is a light rail service of Boston's MBTA Green Line that runs primarily along Beacon Street between downtown Boston and the suburb of Brookline.
-
E.
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.
- 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 Union Square branch Target entity description: The Green Line Union Square branch is a light rail extension of Boston’s MBTA Green Line that serves the Union Square area of Somerville, Massachusetts.
-
A.
Green Line B branch
The Green Line B branch is a light rail service of Boston's MBTA Green Line that runs along Commonwealth Avenue, primarily serving Boston University and the Allston–Brighton neighborhoods.
-
B.
Red Line Braintree Branch
The Red Line Braintree Branch is a southern extension of Boston's MBTA Red Line rapid transit system that serves communities between Quincy and Braintree.
-
C.
Green Line E branch
The Green Line E branch is a light rail service of Boston's MBTA Green Line that runs from downtown through the Back Bay and Longwood Medical Area to Heath Street in Jamaica Plain.
-
D.
Green Line C Branch
The Green Line C Branch is a light rail service of Boston's MBTA Green Line that runs primarily along Beacon Street between downtown Boston and the suburb of Brookline.
-
E.
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.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
MBTA Green Line branch
ⓘ
light rail line ⓘ |
| color | green ⓘ |
| connectsWith |
MBTA bus network
ⓘ
other MBTA Green Line branches ⓘ |
| constructionType |
at-grade
ⓘ
elevated ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| electrification | overhead catenary ⓘ |
| fareSystem | MBTA fare system ⓘ |
| hasStation |
Lechmere station
ⓘ
Union Square station ⓘ |
| locatedIn |
Greater Boston
ⓘ
Somerville, Massachusetts ⓘ |
| modeOfTransport | light rail ⓘ |
| openedForService | 2022 ⓘ |
| operator |
MBTA
ⓘ
surface form:
Massachusetts Bay Transportation Authority
|
| owner |
MBTA
ⓘ
surface form:
Massachusetts Bay Transportation Authority
|
| partOf | MBTA Green Line ⓘ |
| partOfProject | Green Line Extension ⓘ |
| primaryPurpose |
expand MBTA rapid transit coverage
ⓘ
improve transit access to Somerville ⓘ |
| regionServed |
Greater Boston
ⓘ
surface form:
Boston metropolitan area
|
| serves |
Somerville, Massachusetts
ⓘ
Union Square ⓘ |
| servesNeighborhood |
Union Square, Somerville
ⓘ
surface form:
Union Square neighborhood of Somerville
|
| system |
MBTA
ⓘ
surface form:
MBTA subway
|
| terminus |
Lechmere station
ⓘ
Union Square station ⓘ |
| trackGauge | standard gauge ⓘ |
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 Union Square branch Description of subject: The Green Line Union Square branch is a light rail extension of Boston’s MBTA Green Line that serves the Union Square area of Somerville, Massachusetts.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Green Line (MBTA)
this entity surface form:
Green Line Union Square Branch
this entity surface form:
Green Line Union Square Branch
this entity surface form:
Union Square Branch of the Green Line