Red Line Northwest Extension corridor
E166449
The Red Line Northwest Extension corridor is a planned expansion route of Boston's MBTA Red Line intended to extend rapid transit service northwest from its current terminus.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Red Line Northwest Extension corridor canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1057806 — 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: Red Line Northwest Extension corridor Context triple: [Porter (MBTA station), servesCorridor, Red Line Northwest Extension corridor]
-
A.
Blue Line
The Blue Line is one of the color-coded rapid transit routes in the Washington Metro system, running through key parts of Washington, D.C. and its Virginia suburbs.
-
B.
Blue Line
The Blue Line is one of Boston's MBTA rapid transit routes, running primarily between downtown Boston and the coastal communities of East Boston and Revere.
-
C.
Blue Line
The Blue Line is one of the primary heavy-rail transit routes in Atlanta’s MARTA system, running east–west across the metropolitan area and serving key urban and suburban stations.
-
D.
Blue Line
The Blue Line is one of the main lines of the Lisbon Metro system, serving key central and northern areas of Portugal’s capital city.
-
E.
Blue Line
The Blue Line is a major rapid transit route in Chicago that runs between O'Hare International Airport and the city's western suburbs via downtown.
- 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: Red Line Northwest Extension corridor Target entity description: The Red Line Northwest Extension corridor is a planned expansion route of Boston's MBTA Red Line intended to extend rapid transit service northwest from its current terminus.
-
A.
Blue Line
The Blue Line is one of the color-coded rapid transit routes in the Washington Metro system, running through key parts of Washington, D.C. and its Virginia suburbs.
-
B.
Blue Line
The Blue Line is one of Boston's MBTA rapid transit routes, running primarily between downtown Boston and the coastal communities of East Boston and Revere.
-
C.
Blue Line
The Blue Line is one of the primary heavy-rail transit routes in Atlanta’s MARTA system, running east–west across the metropolitan area and serving key urban and suburban stations.
-
D.
Blue Line
The Blue Line is one of the main lines of the Lisbon Metro system, serving key central and northern areas of Portugal’s capital city.
-
E.
Blue Line
The Blue Line is a major rapid transit route in Chicago that runs between O'Hare International Airport and the city's western suburbs via downtown.
- F. None of above. chosen
Statements (27)
| Predicate | Object |
|---|---|
| instanceOf |
MBTA Red Line extension project
ⓘ
planned transit corridor ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| electrification | third rail (planned, consistent with MBTA Red Line) ⓘ |
| fareSystem | MBTA fare system ⓘ |
| hasGauge | standard gauge ⓘ |
| infrastructureType | rail transit corridor ⓘ |
| intendedUsers |
commuters
ⓘ
local residents ⓘ |
| locatedIn |
Massachusetts
ⓘ
United States of America ⓘ
surface form:
United States
|
| networkRole | Red Line northwest branch ⓘ |
| operator |
MBTA
ⓘ
surface form:
Massachusetts Bay Transportation Authority
|
| partOf |
MBTA Red Line
ⓘ
Massachusetts Bay Transportation Authority network ⓘ |
| plannedDirection | northwest ⓘ |
| planningAuthority |
MBTA
ⓘ
surface form:
Massachusetts Bay Transportation Authority
|
| projectPhase | corridor planning ⓘ |
| purpose |
extend rapid transit service
ⓘ
improve regional transit connectivity ⓘ |
| railSystem |
MBTA
ⓘ
surface form:
MBTA subway
|
| regionServed |
Greater Boston
ⓘ
surface form:
Greater Boston area
|
| serviceType | heavy rail rapid transit ⓘ |
| startPoint | current northwest terminus of the MBTA Red Line ⓘ |
| state | Massachusetts ⓘ |
| status | planned ⓘ |
| transportMode | rapid transit ⓘ |
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: Red Line Northwest Extension corridor Description of subject: The Red Line Northwest Extension corridor is a planned expansion route of Boston's MBTA Red Line intended to extend rapid transit service northwest from its current terminus.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.