Downtown Ottawa tunnel
E605070
The Downtown Ottawa tunnel is an underground light rail transit tunnel beneath Ottawa’s downtown core that carries the city’s Confederation Line.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Downtown Ottawa tunnel canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6524418 — 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: Downtown Ottawa tunnel Context triple: [Confederation Line, usesTunnel, Downtown Ottawa tunnel]
-
A.
Queensway Tunnel
The Queensway Tunnel is a road tunnel in northwest England that carries vehicular traffic beneath the River Mersey between Liverpool and the Wirral Peninsula.
-
B.
Downtown Tunnel
The Downtown Tunnel is a major underwater vehicular tunnel in the Hampton Roads region that carries traffic beneath the Elizabeth River between Norfolk and Portsmouth, Virginia.
-
C.
Brockville Railway Tunnel
The Brockville Railway Tunnel is Canada's oldest railway tunnel, a historic 19th-century stone passage beneath downtown Brockville that now serves as a popular illuminated pedestrian attraction.
-
D.
Montague Street Tunnel
The Montague Street Tunnel is a New York City Subway tunnel under the East River that carries trains between Manhattan and Brooklyn.
-
E.
Prudential Tunnel
Prudential Tunnel is a vehicular tunnel in Boston, Massachusetts, that carries traffic beneath the Prudential Center complex as part of the Massachusetts Turnpike.
- 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: Downtown Ottawa tunnel Target entity description: The Downtown Ottawa tunnel is an underground light rail transit tunnel beneath Ottawa’s downtown core that carries the city’s Confederation Line.
-
A.
Queensway Tunnel
The Queensway Tunnel is a road tunnel in northwest England that carries vehicular traffic beneath the River Mersey between Liverpool and the Wirral Peninsula.
-
B.
Downtown Tunnel
The Downtown Tunnel is a major underwater vehicular tunnel in the Hampton Roads region that carries traffic beneath the Elizabeth River between Norfolk and Portsmouth, Virginia.
-
C.
Brockville Railway Tunnel
The Brockville Railway Tunnel is Canada's oldest railway tunnel, a historic 19th-century stone passage beneath downtown Brockville that now serves as a popular illuminated pedestrian attraction.
-
D.
Montague Street Tunnel
The Montague Street Tunnel is a New York City Subway tunnel under the East River that carries trains between Manhattan and Brooklyn.
-
E.
Prudential Tunnel
Prudential Tunnel is a vehicular tunnel in Boston, Massachusetts, that carries traffic beneath the Prudential Center complex as part of the Massachusetts Turnpike.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
railway tunnel
ⓘ
transport infrastructure ⓘ |
| cityServed | Ottawa NERFINISHED ⓘ |
| connects |
east of downtown Ottawa
ⓘ
west of downtown Ottawa ⓘ |
| constructionMethod | tunnel boring and mining techniques ⓘ |
| constructionStart | 2013 ⓘ |
| country | Canada ⓘ |
| electrification | overhead catenary ⓘ |
| endPoint | uOttawa station NERFINISHED ⓘ |
| fundedBy |
City of Ottawa
NERFINISHED
ⓘ
Government of Canada NERFINISHED ⓘ Government of Ontario NERFINISHED ⓘ |
| gauge | standard gauge ⓘ |
| hasStation |
Lyon station
NERFINISHED
ⓘ
Parliament station NERFINISHED ⓘ Rideau station NERFINISHED ⓘ |
| line | Confederation Line NERFINISHED ⓘ |
| locatedIn |
Canada
ⓘ
Ontario ⓘ Ottawa ⓘ |
| locatedUnder |
Ottawa’s central business district
NERFINISHED
ⓘ
downtown Ottawa NERFINISHED ⓘ |
| openingDate | 2019 ⓘ |
| openingForService | September 14, 2019 ⓘ |
| operator | OC Transpo NERFINISHED ⓘ |
| owner | City of Ottawa NERFINISHED ⓘ |
| partOf |
Confederation Line
NERFINISHED
ⓘ
O-Train network NERFINISHED ⓘ |
| partOfProject | Stage 1 Confederation Line project ⓘ |
| passesThrough |
Lyon station
NERFINISHED
ⓘ
Parliament station NERFINISHED ⓘ Rideau station NERFINISHED ⓘ |
| purpose |
rapid transit
ⓘ
reduce bus congestion downtown ⓘ |
| regionServed | National Capital Region NERFINISHED ⓘ |
| safetyFeature |
emergency exits
ⓘ
fire suppression systems ⓘ ventilation systems ⓘ |
| startPoint | Lyon station NERFINISHED ⓘ |
| status | in operation ⓘ |
| system | O-Train NERFINISHED ⓘ |
| trackType | double track ⓘ |
| trafficType | passenger trains ⓘ |
| underground | true ⓘ |
| use | light rail transit ⓘ |
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: Downtown Ottawa tunnel Description of subject: The Downtown Ottawa tunnel is an underground light rail transit tunnel beneath Ottawa’s downtown core that carries the city’s Confederation Line.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.