Tunnel No. 1 (Marin County)
E789374
Tunnel No. 1 (Marin County) is a historic Northwestern Pacific Railroad tunnel in Marin County, California, that formed part of the early rail route connecting the North Bay to the broader regional rail network.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Tunnel No. 1 (Marin County) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9285537 — 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: Tunnel No. 1 (Marin County) Context triple: [Northwestern Pacific Railroad, hasTunnel, Tunnel No. 1 (Marin County)]
-
A.
Tunnel No. 1
Tunnel No. 1 is a major water-supply tunnel that forms part of New York City’s underground distribution system.
-
B.
State Route 99 Tunnel
The State Route 99 Tunnel is a major underground highway tunnel in Seattle that replaced the Alaskan Way Viaduct to carry traffic along the State Route 99 corridor.
-
C.
Tunnel No. 2
Tunnel No. 2 is one of New York City’s major water distribution tunnels that helps convey drinking water from upstate reservoirs to the city’s boroughs.
-
D.
Sutro Tunnel
The Sutro Tunnel is a historic drainage and access tunnel driven into Nevada’s Comstock Lode in the 19th century to improve mine safety and operations.
-
E.
San Bernardino Tunnel
The San Bernardino Tunnel is a major road tunnel in the Swiss Alps that provides a key north–south transit route between German-speaking and Italian-speaking Switzerland.
- 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: Tunnel No. 1 (Marin County) Target entity description: Tunnel No. 1 (Marin County) is a historic Northwestern Pacific Railroad tunnel in Marin County, California, that formed part of the early rail route connecting the North Bay to the broader regional rail network.
-
A.
Tunnel No. 1
Tunnel No. 1 is a major water-supply tunnel that forms part of New York City’s underground distribution system.
-
B.
State Route 99 Tunnel
The State Route 99 Tunnel is a major underground highway tunnel in Seattle that replaced the Alaskan Way Viaduct to carry traffic along the State Route 99 corridor.
-
C.
Tunnel No. 2
Tunnel No. 2 is one of New York City’s major water distribution tunnels that helps convey drinking water from upstate reservoirs to the city’s boroughs.
-
D.
Sutro Tunnel
The Sutro Tunnel is a historic drainage and access tunnel driven into Nevada’s Comstock Lode in the 19th century to improve mine safety and operations.
-
E.
San Bernardino Tunnel
The San Bernardino Tunnel is a major road tunnel in the Swiss Alps that provides a key north–south transit route between German-speaking and Italian-speaking Switzerland.
- F. None of above. chosen
Statements (20)
| Predicate | Object |
|---|---|
| instanceOf |
historic structure
ⓘ
rail infrastructure ⓘ railway tunnel ⓘ |
| connectsRegion | North Bay ⓘ |
| connectsTo | regional rail network ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| county | Marin County ⓘ |
| hasHeritageValue | yes ⓘ |
| heritageStatus | historic railroad tunnel ⓘ |
| historicalRole | part of early rail route linking North Bay to regional rail network ⓘ |
| locatedIn |
California
ⓘ
linked to:
California, United States
Marin County, California ⓘ
linked to:
Marin County
United States ⓘ
linked to:
United States of America
|
| operator | Northwestern Pacific Railroad ⓘ |
| partOf | Northwestern Pacific Railroad ⓘ |
| railwayLine |
Northwestern Pacific Railroad main line
ⓘ
linked to:
Northwestern Pacific Railroad
|
| regionServed |
North Bay, San Francisco Bay Area
ⓘ
linked to:
North Bay (San Francisco Bay Area)
|
| state |
California
ⓘ
linked to:
California, United States
|
| transportMode | railway ⓘ |
| usedFor | rail transport ⓘ |
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: Tunnel No. 1 (Marin County) Description of subject: Tunnel No. 1 (Marin County) is a historic Northwestern Pacific Railroad tunnel in Marin County, California, that formed part of the early rail route connecting the North Bay to the broader regional rail network.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.