Main Line Elevated
E186607
Main Line Elevated was Boston’s original elevated rapid transit line that formed the core of what is now the MBTA Orange Line.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Main Line Elevated canonical | 5 |
| Main Line Elevated (pre-color coding) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1642784 — 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: Main Line Elevated Context triple: [Sullivan Square station, formerService, Main Line Elevated]
-
A.
Bridge Line
Bridge Line was a former rapid transit service in the Philadelphia–Camden area that operated across the Benjamin Franklin Bridge before being replaced and expanded by the PATCO Speedline.
-
B.
Pink Line
The Pink Line is a rapid transit route in Chicago's "L" system that runs between the Loop and the city's West Side neighborhoods.
-
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: Main Line Elevated Target entity description: Main Line Elevated was Boston’s original elevated rapid transit line that formed the core of what is now the MBTA Orange Line.
-
A.
Bridge Line
Bridge Line was a former rapid transit service in the Philadelphia–Camden area that operated across the Benjamin Franklin Bridge before being replaced and expanded by the PATCO Speedline.
-
B.
Pink Line
The Pink Line is a rapid transit route in Chicago's "L" system that runs between the Loop and the city's West Side neighborhoods.
-
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
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
defunct railway line
ⓘ
elevated rapid transit line ⓘ former MBTA Orange Line alignment ⓘ |
| closed | 1987 ⓘ |
| colorDesignation |
Orange Line (after MBTA color-coding)
ⓘ
linked to:
Orange Line is colored orange
|
| connectedTo |
Atlantic Avenue Elevated
ⓘ
Washington Street Elevated ⓘ |
| constructionType | steel elevated structure ⓘ |
| electrification | third rail ⓘ |
| fareCollection | turnstiles ⓘ |
| formsCoreOf | MBTA Orange Line ⓘ |
| historicalRole |
backbone of Boston Elevated Railway rapid transit network
ⓘ
first trunk rapid transit line in Boston ⓘ |
| legacy | formed core alignment for MBTA Orange Line until 1987 ⓘ |
| locatedIn |
Boston
ⓘ
linked to:
Boston, Massachusetts
Massachusetts ⓘ United States ⓘ
linked to:
United States of America
|
| opened | 1901 ⓘ |
| openedSection | Sullivan Square to Dudley Street ⓘ |
| operatedBy |
Boston Elevated Railway
ⓘ
Massachusetts Bay Transportation Authority ⓘ
linked to:
MBTA
Metropolitan Transit Authority (Boston) ⓘ
linked to:
Metropolitan Transit Authority
|
| ownedBy |
Boston Elevated Railway (historically)
ⓘ
linked to:
Boston Elevated Railway
Massachusetts Bay Transportation Authority (final period) ⓘ
linked to:
MBTA
Metropolitan Transit Authority (later period) ⓘ
linked to:
Metropolitan Transit Authority
|
| partOf |
Boston Elevated Railway system
ⓘ
linked to:
Boston Elevated Railway
Boston rapid transit system ⓘ |
| predecessorOf | MBTA Orange Line ⓘ |
| replacedBy |
Southwest Corridor alignment of the Orange Line
ⓘ
relocated MBTA Orange Line ⓘ |
| rightOfWayType | elevated ⓘ |
| servedNeighborhood |
Charlestown
ⓘ
Downtown Boston ⓘ Roxbury ⓘ |
| servedStation |
Dudley Street Terminal
ⓘ
Essex (later Chinatown) ⓘ
linked to:
Chinatown (Boston)
Haymarket ⓘ Milk Street (later part of State complex) ⓘ North Station ⓘ Scollay Square ⓘ
linked to:
Scollay Square (historic site)
State ⓘ Sullivan Square ⓘ |
| serviceType | rapid transit ⓘ |
| successorAlignment | Southwest Corridor ⓘ |
| trackGauge | standard gauge ⓘ |
| usesRollingStockType | heavy-rail rapid transit cars ⓘ |
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: Main Line Elevated Description of subject: Main Line Elevated was Boston’s original elevated rapid transit line that formed the core of what is now the MBTA Orange Line.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Main Line Elevated