O-Train
E48549
The O-Train is Ottawa’s urban rail transit system, providing light rail service across key corridors of Canada’s capital city.
All labels observed (6)
| Label | Occurrences |
|---|---|
| O-Train canonical | 12 |
| O-Train Confederation Line | 5 |
| O-Train light rail system | 2 |
| O-Train Trillium Line | 1 |
| O-Train Trillium Line (nearby) | 1 |
| O-Train rapid transit network | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T224904 — 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: O-Train Context triple: [Ottawa, hasLightRailSystem, O-Train]
-
A.
M train
The M train is a New York City Subway service that runs through parts of Queens, Brooklyn, and Manhattan, connecting neighborhoods such as Middle Village and Forest Hills with Midtown and Lower Manhattan.
-
B.
E train
The E train is a New York City Subway service that runs primarily along the IND Eighth Avenue Line, providing rapid transit between Queens and Manhattan.
-
C.
L train
The L train is a New York City Subway service that runs crosstown along 14th Street in Manhattan and through Williamsburg and Bushwick in Brooklyn, known for its heavy ridership and role as a key connector between the boroughs.
-
D.
AeroTrain
AeroTrain is an automated underground people mover system that transports passengers between terminals at Washington Dulles International Airport.
-
E.
W train
The W train is a local service of the New York City Subway that runs primarily in Manhattan and Queens, connecting Astoria to Lower Manhattan via the Broadway Line.
- 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: O-Train Target entity description: The O-Train is Ottawa’s urban rail transit system, providing light rail service across key corridors of Canada’s capital city.
-
A.
M train
The M train is a New York City Subway service that runs through parts of Queens, Brooklyn, and Manhattan, connecting neighborhoods such as Middle Village and Forest Hills with Midtown and Lower Manhattan.
-
B.
E train
The E train is a New York City Subway service that runs primarily along the IND Eighth Avenue Line, providing rapid transit between Queens and Manhattan.
-
C.
L train
The L train is a New York City Subway service that runs crosstown along 14th Street in Manhattan and through Williamsburg and Bushwick in Brooklyn, known for its heavy ridership and role as a key connector between the boroughs.
-
D.
AeroTrain
AeroTrain is an automated underground people mover system that transports passengers between terminals at Washington Dulles International Airport.
-
E.
W train
The W train is a local service of the New York City Subway that runs primarily in Manhattan and Queens, connecting Astoria to Lower Manhattan via the Broadway Line.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
light rail transit system
ⓘ
public transport system ⓘ urban rail transit system ⓘ |
| branding | O-Train self-link ⓘ |
| city | Ottawa ⓘ |
| connectsTo |
OC Transpo
ⓘ
surface form:
OC Transpo bus rapid transit system
Ottawa bus network ⓘ |
| country | Canada ⓘ |
| electrification | overhead catenary on Confederation Line ⓘ |
| fareMedium |
OC Transpo tickets and passes accepted
ⓘ
Presto card accepted ⓘ |
| fareSystem | integrated with OC Transpo bus network ⓘ |
| hasFunction | mass transit ⓘ |
| hasLine |
Confederation Line
ⓘ
Trillium Line ⓘ |
| hasMode | rail ⓘ |
| hasStationType |
at-grade stations
ⓘ
elevated stations ⓘ underground stations ⓘ |
| inception | 2001 ⓘ |
| languageOfSignage |
English
ⓘ
French ⓘ |
| laterServiceType | electric light rail ⓘ |
| locatedIn |
Canada
ⓘ
Ontario ⓘ Ottawa ⓘ |
| notableLine |
Trillium Line
ⓘ
surface form:
Line 1 (Confederation Line)
Trillium Line ⓘ
surface form:
Line 2 (Trillium Line)
|
| numberOfLines | 2 ⓘ |
| operator | OC Transpo ⓘ |
| originalServiceType | diesel light rail ⓘ |
| owner |
Ottawa
ⓘ
surface form:
City of Ottawa
|
| peakUse | commuter travel ⓘ |
| primaryCorridor |
east–west corridor through central Ottawa
ⓘ
north–south corridor through Ottawa ⓘ |
| publicTransportAuthority | OC Transpo ⓘ |
| regionServed | National Capital Region of Canada ⓘ |
| safetySystem | modern train control and signaling (varies by line) ⓘ |
| serves |
Ottawa
ⓘ
surface form:
City of Ottawa
downtown Ottawa ⓘ suburban areas of Ottawa ⓘ |
| servesRole | rapid transit backbone of Ottawa transit network ⓘ |
| serviceArea | key urban corridors of Ottawa ⓘ |
| ticketingIntegration | integrated with STO bus services via fare agreements ⓘ |
| trackOwnership |
Ottawa
ⓘ
surface form:
City of Ottawa
|
| transitType | light rail ⓘ |
| usesTrackGauge | standard gauge ⓘ |
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: O-Train Description of subject: The O-Train is Ottawa’s urban rail transit system, providing light rail service across key corridors of Canada’s capital city.
Referenced by (22)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
O-Train Confederation Line
this entity surface form:
O-Train Confederation Line
this entity surface form:
O-Train Confederation Line
this entity surface form:
O-Train Confederation Line
this entity surface form:
O-Train rapid transit network
this entity surface form:
O-Train light rail system
this entity surface form:
O-Train Trillium Line (nearby)
this entity surface form:
O-Train Trillium Line
this entity surface form:
O-Train Confederation Line
this entity surface form:
O-Train light rail system