Line 3 Scarborough (closed in 2023)
E7282
Line 3 Scarborough (closed in 2023) was a light metro line in Toronto’s transit system that connected the city’s eastern Scarborough district to the broader subway network.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Line 3 (future Ontario Line terminus nearby) | 1 |
| Line 3 Scarborough (closed in 2023) canonical | 1 |
| Line 3 Scarborough (until 2023) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T76410 — 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: Line 3 Scarborough (closed in 2023) Context triple: [Toronto, hasSubwayLine, Line 3 Scarborough (closed in 2023)]
-
A.
Portland Streetcar
Portland Streetcar is a modern urban streetcar transit system serving central Portland, Oregon, connecting key neighborhoods, employment centers, and educational institutions.
-
B.
CTA Red Line Sox–35th station
CTA Red Line Sox–35th station is a Chicago Transit Authority rapid transit stop on the Red Line that serves the Bridgeport neighborhood and provides access to the Chicago White Sox’s home ballpark.
-
C.
Fife Circle Line
The Fife Circle Line is a suburban rail route in Fife, Scotland, forming a loop north of Edinburgh that serves towns such as Dunfermline, Kirkcaldy, and Glenrothes with Thornton.
-
D.
Manchester Metrolink
Manchester Metrolink is a light rail/tram network serving Greater Manchester, England, connecting the city centre with surrounding suburbs and key regional destinations.
-
E.
AeroTrain
AeroTrain is an automated underground people mover system that transports passengers between terminals at Washington Dulles International Airport.
- 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: Line 3 Scarborough (closed in 2023) Target entity description: Line 3 Scarborough (closed in 2023) was a light metro line in Toronto’s transit system that connected the city’s eastern Scarborough district to the broader subway network.
-
A.
Portland Streetcar
Portland Streetcar is a modern urban streetcar transit system serving central Portland, Oregon, connecting key neighborhoods, employment centers, and educational institutions.
-
B.
CTA Red Line Sox–35th station
CTA Red Line Sox–35th station is a Chicago Transit Authority rapid transit stop on the Red Line that serves the Bridgeport neighborhood and provides access to the Chicago White Sox’s home ballpark.
-
C.
Fife Circle Line
The Fife Circle Line is a suburban rail route in Fife, Scotland, forming a loop north of Edinburgh that serves towns such as Dunfermline, Kirkcaldy, and Glenrothes with Thornton.
-
D.
Manchester Metrolink
Manchester Metrolink is a light rail/tram network serving Greater Manchester, England, connecting the city centre with surrounding suburbs and key regional destinations.
-
E.
AeroTrain
AeroTrain is an automated underground people mover system that transports passengers between terminals at Washington Dulles International Airport.
- F. None of above. chosen
Statements (38)
| Predicate | Object |
|---|---|
| instanceOf |
former rapid transit line
ⓘ
light metro line ⓘ public transit infrastructure ⓘ |
| cityServed | Toronto ⓘ |
| closed | 2023 ⓘ |
| closureReason |
age and reliability concerns
ⓘ
replacement by bus service pending subway extension ⓘ |
| colorOnMap | blue ⓘ |
| connectsDistrict | Scarborough to broader subway network ⓘ |
| connectsTo | Line 2 Bloor–Danforth ⓘ |
| country | Canada ⓘ |
| electrification | third rail ⓘ |
| fareSystem | TTC fare system ⓘ |
| lineNumber | 3 ⓘ |
| lineType | elevated and at-grade ⓘ |
| locatedIn |
Canada
ⓘ
Ontario ⓘ Toronto ⓘ |
| numberOfStations | 6 ⓘ |
| opened | 1985 ⓘ |
| operator | Toronto Transit Commission ⓘ |
| owner | Toronto Transit Commission ⓘ |
| partOf |
Toronto Transit Commission network
ⓘ
Toronto subway ⓘ
surface form:
Toronto subway system
|
| plannedSuccessor |
Line 3 Scarborough
ⓘ
surface form:
Scarborough Subway Extension of Line 2
|
| previousDesignation |
SRT
ⓘ
Scarborough RT ⓘ |
| primaryFunction | connect Scarborough to Toronto subway network ⓘ |
| regionServed | eastern Scarborough ⓘ |
| replacedBy | bus replacement service ⓘ |
| serves |
Scarborough
ⓘ
surface form:
Scarborough district
|
| status | closed ⓘ |
| terminusAt |
Kennedy station
ⓘ
McCowan station ⓘ |
| trackGauge | standard gauge ⓘ |
| transitMode | light metro ⓘ |
| usesRollingStock | UTDC ICTS Mark I vehicles ⓘ |
| usesTechnology | Intermediate Capacity Transit System ⓘ |
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: Line 3 Scarborough (closed in 2023) Description of subject: Line 3 Scarborough (closed in 2023) was a light metro line in Toronto’s transit system that connected the city’s eastern Scarborough district to the broader subway network.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Line 3 Scarborough (until 2023)
subject surface form:
Union Station (Toronto)
this entity surface form:
Line 3 (future Ontario Line terminus nearby)