Downtown Seattle Transit Tunnel
E373218
The Downtown Seattle Transit Tunnel is a former dual-use bus and light rail tunnel running beneath central Seattle that served as a major rapid transit corridor through the city’s downtown.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Downtown Seattle Transit Tunnel canonical | 3 |
| Downtown Seattle Transit Tunnel (former bus tunnel, now light rail) | 1 |
| Washington State Convention Center tunnel | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3615465 — 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 Seattle Transit Tunnel Context triple: [University Street Station, partOf, Downtown Seattle Transit Tunnel]
-
A.
53rd Street Tunnel
The 53rd Street Tunnel is a New York City Subway tunnel under the East River that carries IND Queens Boulevard Line trains between Manhattan and Queens.
-
B.
Center City Tunnel
Center City Tunnel is an underground rail corridor in downtown Philadelphia that links several major commuter rail lines to create a unified through-running system.
-
C.
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.
-
D.
Transbay Tube
The Transbay Tube is an underwater rail tunnel beneath San Francisco Bay that carries BART trains between San Francisco and Oakland.
-
E.
Eisenhower–Johnson Memorial Tunnel
The Eisenhower–Johnson Memorial Tunnel is a high-altitude vehicular tunnel through the Rocky Mountains in Colorado, carrying Interstate 70 beneath the Continental Divide.
- 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 Seattle Transit Tunnel Target entity description: The Downtown Seattle Transit Tunnel is a former dual-use bus and light rail tunnel running beneath central Seattle that served as a major rapid transit corridor through the city’s downtown.
-
A.
53rd Street Tunnel
The 53rd Street Tunnel is a New York City Subway tunnel under the East River that carries IND Queens Boulevard Line trains between Manhattan and Queens.
-
B.
Center City Tunnel
Center City Tunnel is an underground rail corridor in downtown Philadelphia that links several major commuter rail lines to create a unified through-running system.
-
C.
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.
-
D.
Transbay Tube
The Transbay Tube is an underwater rail tunnel beneath San Francisco Bay that carries BART trains between San Francisco and Oakland.
-
E.
Eisenhower–Johnson Memorial Tunnel
The Eisenhower–Johnson Memorial Tunnel is a high-altitude vehicular tunnel through the Rocky Mountains in Colorado, carrying Interstate 70 beneath the Continental Divide.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
bus rapid transit facility
ⓘ
light rail facility ⓘ transit tunnel ⓘ |
| busPowerSupply |
diesel-hybrid buses (later period)
ⓘ
trolleybus overhead wires (historical) ⓘ |
| busServiceEndDate | 2019-03-23 ⓘ |
| busServiceOpeningDate | 1990-09-15 ⓘ |
| connects |
International District
ⓘ
linked to:
Seattle Chinatown–International District
Pioneer Square ⓘ Westlake Center area ⓘ
linked to:
Westlake area
central business district of Seattle ⓘ |
| constructionMethod | cut-and-cover tunneling ⓘ |
| constructionStartDate | 1987 ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| electrification | overhead catenary for light rail ⓘ |
| endStation |
Westlake station
ⓘ
linked to:
Westlake light rail station
|
| formerTerminus | Convention Place station ⓘ |
| formerUse |
bus transit tunnel
ⓘ
dual-use bus and light rail tunnel ⓘ |
| hasFeature |
bus-rail shared right-of-way (historical)
ⓘ
emergency exits ⓘ underground stations ⓘ ventilation system ⓘ |
| hasStation |
Benaroya Hall entrance at University Street station
ⓘ
Convention Place station ⓘ International District/Chinatown station ⓘ Pioneer Square station ⓘ
linked to:
Pioneer Square Station
University Street station ⓘ
linked to:
University Street Station
Westlake station ⓘ
linked to:
Westlake light rail station
|
| length | approximately 1.3 miles ⓘ |
| lightRailServiceOpeningDate | 2009-07-18 ⓘ |
| locatedIn |
Seattle
ⓘ
Washington ⓘ downtown Seattle ⓘ |
| locatedUnder |
3rd Avenue, Seattle
ⓘ
linked to:
3rd Avenue
Pine Street, Seattle ⓘ |
| numberOfStations | 5 ⓘ |
| numberOfTracks | 2 ⓘ |
| openingDate | 1990-09-15 ⓘ |
| operator |
King County Metro
ⓘ
Sound Transit ⓘ |
| owner | King County Metro ⓘ |
| partOf |
Link light rail network
ⓘ
linked to:
Link light rail
Seattle transit system ⓘ
linked to:
Seattle transportation network
|
| purpose | rapid transit corridor through downtown Seattle ⓘ |
| serves |
1 Line
ⓘ
Central Link ⓘ Link light rail ⓘ |
| startStation | International District/Chinatown station ⓘ |
| status | light rail only ⓘ |
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 Seattle Transit Tunnel Description of subject: The Downtown Seattle Transit Tunnel is a former dual-use bus and light rail tunnel running beneath central Seattle that served as a major rapid transit corridor through the city’s downtown.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Downtown Seattle Transit Tunnel
Seattle transportation network
→
hasComponent
→
Downtown Seattle Transit Tunnel (former bus tunnel, now light rail)
ⓘ
linked to: Downtown Seattle Transit Tunnel