Green Line trunk subway
E250636
The Green Line trunk subway is the central underground segment of Boston's MBTA Green Line where multiple light rail branches converge and share tracks through the downtown area.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Green Line trunk | 1 |
| Green Line trunk subway canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2266458 — 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 trunk subway Context triple: [Arlington station, partOf, Green Line trunk subway]
-
A.
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.
-
B.
Green Line
The Green Line is one of the color-coded routes of the Tyne and Wear Metro rapid transit system serving the Newcastle upon Tyne area in northeast England.
-
C.
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.
-
D.
Green Line
The Green Line is a light rail and subway–surface transit line in Philadelphia operated by SEPTA, serving multiple routes that run through Center City and into West Philadelphia.
-
E.
Green Line
The Green Line is the demarcation line established in the 1949 Armistice Agreements that serves as the internationally recognized boundary between Israel and the territories captured in 1967, including the West Bank.
- 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 trunk subway Target entity description: The Green Line trunk subway is the central underground segment of Boston's MBTA Green Line where multiple light rail branches converge and share tracks through the downtown area.
-
A.
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.
-
B.
Green Line
The Green Line is one of the color-coded routes of the Tyne and Wear Metro rapid transit system serving the Newcastle upon Tyne area in northeast England.
-
C.
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.
-
D.
Green Line
The Green Line is a light rail and subway–surface transit line in Philadelphia operated by SEPTA, serving multiple routes that run through Center City and into West Philadelphia.
-
E.
Green Line
The Green Line is the demarcation line established in the 1949 Armistice Agreements that serves as the internationally recognized boundary between Israel and the territories captured in 1967, including the West Bank.
- F. None of above. chosen
Statements (34)
| Predicate | Object |
|---|---|
| instanceOf |
subway line segment
ⓘ
underground light rail corridor ⓘ |
| character | underground ⓘ |
| connectsArea |
Back Bay area
ⓘ
linked to:
Back Bay
Downtown Boston ⓘ Government Center area ⓘ West End area ⓘ |
| electrification | overhead catenary ⓘ |
| fareCollection |
gated fare control at some subway stations
ⓘ
proof-of-payment on surface segments ⓘ |
| fareSystem | MBTA fare system ⓘ |
| 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 ⓘ |
| hasFeature |
multiple tracks
ⓘ
tunnels under downtown streets ⓘ underground stations ⓘ |
| hasRollingStock |
MBTA Type 7 light rail vehicle
ⓘ
linked to:
MBTA Type 7 Light Rail Vehicle
MBTA Type 8 light rail vehicle ⓘ
linked to:
MBTA Type 8 Light Rail Vehicle
MBTA Type 9 light rail vehicle ⓘ
linked to:
MBTA Type 9 Light Rail Vehicle
|
| isSharedBy | multiple Green Line branches ⓘ |
| locatedIn |
Boston
ⓘ
linked to:
Boston, Massachusetts
Massachusetts ⓘ United States ⓘ
linked to:
United States of America
|
| operator |
Massachusetts Bay Transportation Authority
ⓘ
linked to:
MBTA
|
| owner |
Massachusetts Bay Transportation Authority
ⓘ
linked to:
MBTA
|
| partOf | MBTA Green Line ⓘ |
| primaryFunction | to carry Green Line trains through central Boston ⓘ |
| safetySystem | signalized light rail operation ⓘ |
| servicePattern | multiple branches share tracks through downtown ⓘ |
| system |
MBTA subway
ⓘ
linked to:
MBTA
|
| trackGauge | standard gauge ⓘ |
| 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 trunk subway Description of subject: The Green Line trunk subway is the central underground segment of Boston's MBTA Green Line where multiple light rail branches converge and share tracks through the downtown area.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Green Line trunk subway