Boston Subdivision
E640907
The Boston Subdivision is a major freight and passenger rail corridor in Massachusetts that forms part of the main line between Boston and points west.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Boston Subdivision canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T7077358 — 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: Boston Subdivision Context triple: [Framingham/Worcester Line, usesRailwayLine, Boston Subdivision]
-
A.
Lowell Line
The Lowell Line is a Massachusetts Bay Transportation Authority commuter rail route that runs between Boston’s North Station and the city of Lowell, serving communities in the Merrimack Valley.
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B.
Weston Subdivision
Weston Subdivision is a key railway corridor in the Greater Toronto Area used by GO Transit and other operators for commuter and freight rail services.
-
C.
Green Line West Branch
The Green Line West Branch is a segment of Chicago's 'L' rapid transit system that carries Green Line trains between Harlem/Lake and Ashland/63rd on the city's West Side.
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D.
Mattapan Line
The Mattapan Line is a light rail trolley service in Boston, Massachusetts, operating as part of the MBTA's Red Line system between Ashmont and Mattapan.
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E.
Hudson Subdivision
The Hudson Subdivision is a key railroad line in New York State that carries passenger and freight trains along the Hudson River corridor, including service through Albany–Rensselaer station.
- 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: Boston Subdivision Target entity description: The Boston Subdivision is a major freight and passenger rail corridor in Massachusetts that forms part of the main line between Boston and points west.
-
A.
Lowell Line
The Lowell Line is a Massachusetts Bay Transportation Authority commuter rail route that runs between Boston’s North Station and the city of Lowell, serving communities in the Merrimack Valley.
-
B.
Weston Subdivision
Weston Subdivision is a key railway corridor in the Greater Toronto Area used by GO Transit and other operators for commuter and freight rail services.
-
C.
Green Line West Branch
The Green Line West Branch is a segment of Chicago's 'L' rapid transit system that carries Green Line trains between Harlem/Lake and Ashland/63rd on the city's West Side.
-
D.
Mattapan Line
The Mattapan Line is a light rail trolley service in Boston, Massachusetts, operating as part of the MBTA's Red Line system between Ashmont and Mattapan.
-
E.
Hudson Subdivision
The Hudson Subdivision is a key railroad line in New York State that carries passenger and freight trains along the Hudson River corridor, including service through Albany–Rensselaer station.
- F. None of above. chosen
Statements (26)
| Predicate | Object |
|---|---|
| instanceOf |
rail corridor
ⓘ
railway line ⓘ |
| connectsCity | Boston ⓘ |
| connectsTo |
rail lines to western Massachusetts
ⓘ
rail lines toward New York State ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| electrification | not electrified ⓘ |
| formsPartOf | main line between Boston and points west ⓘ |
| hasFunction |
regional freight corridor
ⓘ
regional passenger corridor ⓘ |
| hasService |
commuter rail trains
ⓘ
freight trains ⓘ intercity passenger trains ⓘ |
| hasTrackGauge | standard gauge ⓘ |
| isPartOfCorridor | east–west rail corridor in Massachusetts ⓘ |
| locatedIn |
Massachusetts
ⓘ
New England ⓘ |
| locatedInTimeZone | Eastern Time Zone ⓘ |
| operator | CSX Transportation ⓘ |
| owner | CSX Transportation ⓘ |
| partOf |
CSX Transportation network
ⓘ
linked to:
CSX Transportation
|
| signallingSystem | wayside signals ⓘ |
| terminus | Boston, Massachusetts ⓘ |
| trafficType | mixed traffic ⓘ |
| usedFor |
freight rail transport
ⓘ
passenger rail transport ⓘ |
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: Boston Subdivision Description of subject: The Boston Subdivision is a major freight and passenger rail corridor in Massachusetts that forms part of the main line between Boston and points west.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.