Union Square station (Somerville)
E260828
Union Square station (Somerville) is an MBTA Green Line light rail station in Somerville, Massachusetts, serving as the line’s northern terminus and a key part of the Green Line Extension project.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Union Square station (Somerville) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2383531 — 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: Union Square station (Somerville) Context triple: [Green Line (MBTA), terminus, Union Square station (Somerville)]
-
A.
MBTA Silver Hill station
MBTA Silver Hill station is a small commuter rail stop on the Massachusetts Bay Transportation Authority’s Fitchburg Line serving the Silver Hill neighborhood of Weston, Massachusetts.
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B.
Roxbury Crossing station
Roxbury Crossing station is an MBTA Orange Line rapid transit stop in Boston, Massachusetts, serving the Mission Hill neighborhood and surrounding areas.
-
C.
Melrose Highlands station
Melrose Highlands station is a commuter rail stop in Melrose, Massachusetts, served by the MBTA on its Haverhill Line.
-
D.
Massachusetts Avenue station
Massachusetts Avenue station is an underground rapid transit stop in Boston, Massachusetts, located in the South End and served by the MBTA's Orange Line.
-
E.
Malden Center station
Malden Center station is a major transit hub in Malden, Massachusetts, serving both MBTA Orange Line subway and commuter rail services.
- 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: Union Square station (Somerville) Target entity description: Union Square station (Somerville) is an MBTA Green Line light rail station in Somerville, Massachusetts, serving as the line’s northern terminus and a key part of the Green Line Extension project.
-
A.
MBTA Silver Hill station
MBTA Silver Hill station is a small commuter rail stop on the Massachusetts Bay Transportation Authority’s Fitchburg Line serving the Silver Hill neighborhood of Weston, Massachusetts.
-
B.
Roxbury Crossing station
Roxbury Crossing station is an MBTA Orange Line rapid transit stop in Boston, Massachusetts, serving the Mission Hill neighborhood and surrounding areas.
-
C.
Melrose Highlands station
Melrose Highlands station is a commuter rail stop in Melrose, Massachusetts, served by the MBTA on its Haverhill Line.
-
D.
Massachusetts Avenue station
Massachusetts Avenue station is an underground rapid transit stop in Boston, Massachusetts, located in the South End and served by the MBTA's Orange Line.
-
E.
Malden Center station
Malden Center station is a major transit hub in Malden, Massachusetts, serving both MBTA Orange Line subway and commuter rail services.
- F. None of above. chosen
Statements (34)
| Predicate | Object |
|---|---|
| instanceOf |
MBTA Green Line station
ⓘ
light rail station ⓘ railway terminus ⓘ |
| accessible | yes ⓘ |
| category |
Buildings and structures in Somerville, Massachusetts
ⓘ
Green Line Extension ⓘ MBTA Green Line stations ⓘ Railway stations in the United States opened in 2022 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| electrification | overhead catenary ⓘ |
| fareSystem | MBTA fare system ⓘ |
| hasBicycleFacilities | yes ⓘ |
| hasBusConnections | yes ⓘ |
| locatedIn |
Massachusetts
ⓘ
Middlesex County, Massachusetts ⓘ Somerville, Massachusetts ⓘ United States of America ⓘ
surface form:
United States
|
| mapSystem | MBTA rapid transit map ⓘ |
| numberOfPlatforms | 1 ⓘ |
| numberOfTracks | 2 ⓘ |
| openingDate | 2022-03-21 ⓘ |
| operator |
MBTA
ⓘ
surface form:
Massachusetts Bay Transportation Authority
|
| ownedBy |
MBTA
ⓘ
surface form:
Massachusetts Bay Transportation Authority
|
| partOf | Green Line Extension ⓘ |
| platformType | island platform ⓘ |
| projectPhase |
Green Line Extension
ⓘ
surface form:
Phase 2 of the Green Line Extension
|
| regionServed | Greater Boston ⓘ |
| role |
northern terminus of the MBTA Green Line
ⓘ
terminus of the Union Square Branch ⓘ |
| servedByBranch |
Green Line Union Square branch
ⓘ
surface form:
Green Line Union Square Branch
|
| servedByLine | MBTA Green Line ⓘ |
| servesNeighborhood | Union Square, Somerville ⓘ |
| structureType | elevated ⓘ |
| transitMode | 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: Union Square station (Somerville) Description of subject: Union Square station (Somerville) is an MBTA Green Line light rail station in Somerville, Massachusetts, serving as the line’s northern terminus and a key part of the Green Line Extension project.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Green Line (MBTA)