Summit Tunnel
E721092
Summit Tunnel is a historic railroad tunnel driven through the Sierra Nevada in California, notable for its challenging 19th-century construction as part of the First Transcontinental Railroad.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Summit Tunnel canonical | 1 |
| Tunnel No. 6 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8255221 — 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: Summit Tunnel Context triple: [Summit Tunnel in the Sierra Nevada, alsoKnownAs, Summit Tunnel]
-
A.
Sumner Tunnel
The Sumner Tunnel is a major vehicular tunnel in Boston that carries traffic under Boston Harbor between East Boston and downtown.
-
B.
Bosley Tunnel
Bosley Tunnel is a historic narrowboat canal tunnel in Cheshire, England, forming part of the Macclesfield Canal navigation route.
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C.
O'Neill Tunnel
The O'Neill Tunnel is a major highway tunnel in downtown Boston that carries Interstate 93 beneath the city as part of the Big Dig project.
-
D.
Anton Anderson Memorial Tunnel
The Anton Anderson Memorial Tunnel is a combined rail and highway tunnel in Alaska that provides the only road access to the town of Whittier through the Chugach Mountains.
-
E.
Malinta Tunnel
Malinta Tunnel is a historic underground complex on Corregidor Island in the Philippines that served as a bomb-proof headquarters and hospital for American and Filipino forces during World War II.
- 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: Summit Tunnel Target entity description: Summit Tunnel is a historic railroad tunnel driven through the Sierra Nevada in California, notable for its challenging 19th-century construction as part of the First Transcontinental Railroad.
-
A.
Sumner Tunnel
The Sumner Tunnel is a major vehicular tunnel in Boston that carries traffic under Boston Harbor between East Boston and downtown.
-
B.
Bosley Tunnel
Bosley Tunnel is a historic narrowboat canal tunnel in Cheshire, England, forming part of the Macclesfield Canal navigation route.
-
C.
O'Neill Tunnel
The O'Neill Tunnel is a major highway tunnel in downtown Boston that carries Interstate 93 beneath the city as part of the Big Dig project.
-
D.
Anton Anderson Memorial Tunnel
The Anton Anderson Memorial Tunnel is a combined rail and highway tunnel in Alaska that provides the only road access to the town of Whittier through the Chugach Mountains.
-
E.
Malinta Tunnel
Malinta Tunnel is a historic underground complex on Corregidor Island in the Philippines that served as a bomb-proof headquarters and hospital for American and Filipino forces during World War II.
- F. None of above. chosen
Statements (39)
| Predicate | Object |
|---|---|
| instanceOf |
historic site
ⓘ
railroad tunnel ⓘ railway infrastructure ⓘ |
| associatedWith |
Central Pacific–Union Pacific transcontinental route
NERFINISHED
ⓘ
Chinese railroad workers ⓘ |
| builtBy | Central Pacific Railroad NERFINISHED ⓘ |
| category |
First Transcontinental Railroad infrastructure
NERFINISHED
ⓘ
Historic civil engineering works in the United States ⓘ Railroad tunnels in California ⓘ |
| constructionEndDate | 1867 ⓘ |
| constructionMethod |
hand drilling and black powder blasting
ⓘ
nitroglycerin blasting in later stages ⓘ |
| constructionStartDate | 1865 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| crosses | Sierra Nevada crest near Donner Pass NERFINISHED ⓘ |
| elevation | approximately 7,000 feet above sea level ⓘ |
| gauge | standard gauge ⓘ |
| hasHeritageStatus | historic railroad structure ⓘ |
| historicalPeriod | 19th century ⓘ |
| laterOperator |
Southern Pacific Railroad
NERFINISHED
ⓘ
Union Pacific Railroad NERFINISHED ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
Nevada County, California NERFINISHED ⓘ Placer County, California NERFINISHED ⓘ Sierra Nevada NERFINISHED ⓘ |
| locatedNear | Donner Pass NERFINISHED ⓘ |
| material | granite ⓘ |
| nearbyFeature |
Donner Lake
NERFINISHED
ⓘ
Historic Donner Pass wagon route ⓘ |
| notableFor |
challenging 19th-century mountain tunneling
ⓘ
role in completion of the First Transcontinental Railroad ⓘ use of Chinese immigrant labor ⓘ |
| opened | 1867 ⓘ |
| originalOperator | Central Pacific Railroad NERFINISHED ⓘ |
| partOf |
Central Pacific Railroad main line
NERFINISHED
ⓘ
First Transcontinental Railroad NERFINISHED ⓘ |
| passesThrough | Sierra Nevada granite ridge NERFINISHED ⓘ |
| significance | enabled rail crossing of the Sierra Nevada for the transcontinental line ⓘ |
| 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: Summit Tunnel Description of subject: Summit Tunnel is a historic railroad tunnel driven through the Sierra Nevada in California, notable for its challenging 19th-century construction as part of the First Transcontinental Railroad.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Tunnel No. 6