Red Line trunk
E539537
The Red Line trunk is the central, shared main segment of Boston's MBTA Red Line rapid transit route that multiple branches use to travel through the core of the system.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Red Line trunk canonical | 1 |
| Red Line trunk and branches | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5729838 — 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 trunk Context triple: [Davis (MBTA station), isOnBranch, Red Line trunk]
-
A.
Red Line
The Red Line is a primary route of the MetroLink light rail system serving key destinations in the St. Louis metropolitan area.
-
B.
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.
-
C.
Red Line
Red Line is a major rapid transit route in the Washington Metro system, running through key areas of Washington, D.C., and its Maryland suburbs.
-
D.
Red Line
The Red Line is one of the primary heavy-rail rapid transit routes in Atlanta’s MARTA system, running north–south and serving key destinations across the metropolitan area.
-
E.
Red Line
Red Line was the original name of Los Angeles Metro’s B Line, a heavy-rail subway corridor serving key neighborhoods between Downtown Los Angeles and North Hollywood.
- 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 trunk Target entity description: The Red Line trunk is the central, shared main segment of Boston's MBTA Red Line rapid transit route that multiple branches use to travel through the core of the system.
-
A.
Red Line
The Red Line is a primary route of the MetroLink light rail system serving key destinations in the St. Louis metropolitan area.
-
B.
Red Line
Red Line is a major rapid transit route in the Washington Metro system, running through key areas of Washington, D.C., and its Maryland suburbs.
-
C.
Red Line
The Red Line is the primary light rail route of Houston's METRORail system, running through key central corridors including downtown and the Texas Medical Center.
-
D.
Red Line
The Red Line is a light rail route in the Salt Lake City TRAX system that connects key destinations across the Salt Lake Valley.
-
E.
Red Line
The Red Line is one of the primary light rail transit routes in Calgary’s CTrain system, running on a north–south axis through key areas of the city.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
rapid transit line segment
ⓘ
shared trunk line ⓘ |
| colorDesignation | red ⓘ |
| connectsBranch |
Alewife branch
NERFINISHED
ⓘ
Ashmont branch NERFINISHED ⓘ Braintree branch ⓘ |
| connectsToLine |
MBTA Green Line
NERFINISHED
ⓘ
MBTA Orange Line NERFINISHED ⓘ MBTA Silver Line NERFINISHED ⓘ |
| connectsToMode |
commuter rail
ⓘ
intercity bus ⓘ intercity rail ⓘ |
| electrification | third rail ⓘ |
| fareControl |
gated stations
ⓘ
proof-of-payment not used ⓘ |
| fareSystem |
MBTA CharlieCard
NERFINISHED
ⓘ
MBTA CharlieTicket NERFINISHED ⓘ |
| hasStation |
Alewife
NERFINISHED
ⓘ
Andrew NERFINISHED ⓘ Broadway NERFINISHED ⓘ Central NERFINISHED ⓘ Charles/MGH NERFINISHED ⓘ Davis NERFINISHED ⓘ Downtown Crossing NERFINISHED ⓘ Harvard NERFINISHED ⓘ JFK/UMass NERFINISHED ⓘ Kendall/MIT NERFINISHED ⓘ Park Street NERFINISHED ⓘ Porter NERFINISHED ⓘ South Station NERFINISHED ⓘ |
| locatedIn |
Boston, Massachusetts
ⓘ
surface form:
Boston
Massachusetts ⓘ United States of America ⓘ
surface form:
United States
|
| openedAsPartOf | Cambridge subway ⓘ |
| operatedBy |
MBTA
ⓘ
surface form:
Massachusetts Bay Transportation Authority
|
| owner |
MBTA
ⓘ
surface form:
Massachusetts Bay Transportation Authority
|
| partOf | MBTA Red Line NERFINISHED ⓘ |
| primaryFunction | carry Red Line trains through Boston urban core ⓘ |
| railGauge | standard gauge ⓘ |
| safetySystem | automatic train control ⓘ |
| servesArea |
Boston downtown
ⓘ
Cambridge NERFINISHED ⓘ Dorchester NERFINISHED ⓘ South Boston NERFINISHED ⓘ |
| serviceType | rapid transit ⓘ |
| trackConfiguration | double track ⓘ |
| usesSystem | MBTA subway NERFINISHED ⓘ |
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 trunk Description of subject: The Red Line trunk is the central, shared main segment of Boston's MBTA Red Line rapid transit route that multiple branches use to travel through the core of the system.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Red Line trunk and branches