Portland–St. Johnsbury line
E405066
The Portland–St. Johnsbury line was a key Maine Central Railroad route that connected Portland, Maine with St. Johnsbury, Vermont, facilitating regional freight and passenger service across northern New England.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Portland–St. Johnsbury line canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3975620 — 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: Portland–St. Johnsbury line Context triple: [Maine Central Railroad, notableRoute, Portland–St. Johnsbury line]
-
A.
Providence/Stoughton Line
The Providence/Stoughton Line is a Massachusetts Bay Transportation Authority commuter rail route connecting Boston with Providence, Rhode Island and Stoughton, Massachusetts.
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B.
Boston–Portland main line
The Boston–Portland main line is a historic New England railroad corridor connecting Boston, Massachusetts, with Portland, Maine, that has long served as a key passenger and freight route along the region’s coast.
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C.
Boston–Concord main line
The Boston–Concord main line was a principal intercity rail corridor in New England that connected Boston, Massachusetts with Concord, New Hampshire, serving as a key route for the Boston and Maine Railroad.
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D.
Framingham/Worcester Line
The Framingham/Worcester Line is a Massachusetts Bay Transportation Authority commuter rail route connecting Boston with the western suburbs and the city of Worcester.
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E.
Boston–Maine rail network
The Boston–Maine rail network was a regional railroad system in New England that connected major cities and towns, notably linking Boston with communities throughout Maine and neighboring states.
- 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: Portland–St. Johnsbury line Target entity description: The Portland–St. Johnsbury line was a key Maine Central Railroad route that connected Portland, Maine with St. Johnsbury, Vermont, facilitating regional freight and passenger service across northern New England.
-
A.
Providence/Stoughton Line
The Providence/Stoughton Line is a Massachusetts Bay Transportation Authority commuter rail route connecting Boston with Providence, Rhode Island and Stoughton, Massachusetts.
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B.
Boston–Portland main line
The Boston–Portland main line is a historic New England railroad corridor connecting Boston, Massachusetts, with Portland, Maine, that has long served as a key passenger and freight route along the region’s coast.
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C.
Boston–Concord main line
The Boston–Concord main line was a principal intercity rail corridor in New England that connected Boston, Massachusetts with Concord, New Hampshire, serving as a key route for the Boston and Maine Railroad.
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D.
Framingham/Worcester Line
The Framingham/Worcester Line is a Massachusetts Bay Transportation Authority commuter rail route connecting Boston with the western suburbs and the city of Worcester.
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E.
Boston–Maine rail network
The Boston–Maine rail network was a regional railroad system in New England that connected major cities and towns, notably linking Boston with communities throughout Maine and neighboring states.
- F. None of above. chosen
Statements (26)
| Predicate | Object |
|---|---|
| instanceOf |
Maine Central Railroad line
ⓘ
railway line ⓘ |
| category |
rail transport in Maine
ⓘ
rail transport in New Hampshire ⓘ rail transport in Vermont ⓘ |
| connectedCity |
Portland, Maine
NERFINISHED
ⓘ
St. Johnsbury, Vermont NERFINISHED ⓘ |
| connectedState |
Maine
ⓘ
New Hampshire ⓘ Vermont ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| endPoint | St. Johnsbury, Vermont NERFINISHED ⓘ |
| gauge | standard gauge ⓘ |
| historicalRole | key Maine Central Railroad route ⓘ |
| locatedIn |
Maine
ⓘ
New Hampshire ⓘ Vermont ⓘ |
| operator | Maine Central Railroad ⓘ |
| partOf |
Maine Central Railroad
ⓘ
surface form:
Maine Central Railroad Mountain Division
|
| primaryUse | freight transport ⓘ |
| railroadCompany | Maine Central Railroad ⓘ |
| regionServed | northern New England ⓘ |
| secondaryUse | passenger transport ⓘ |
| startPoint | Portland, Maine NERFINISHED ⓘ |
| status |
partly abandoned
ⓘ
partly out of service ⓘ |
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: Portland–St. Johnsbury line Description of subject: The Portland–St. Johnsbury line was a key Maine Central Railroad route that connected Portland, Maine with St. Johnsbury, Vermont, facilitating regional freight and passenger service across northern New England.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.