Summit Tunnel in the Sierra Nevada
E193054
Summit Tunnel in the Sierra Nevada is a historic railroad tunnel blasted through solid granite high in California’s Sierra Nevada mountains as part of the construction of the First Transcontinental Railroad in the 1860s.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Summit Tunnel (Tunnel No. 6) in the Sierra Nevada | 1 |
| Summit Tunnel in the Sierra Nevada canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1742205 — 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 in the Sierra Nevada Context triple: [First Transcontinental Railroad, notableStructure, Summit Tunnel in the Sierra Nevada]
-
A.
Sierra Nevada transportation corridor
The Sierra Nevada transportation corridor is a major east–west route across California’s Sierra Nevada mountains that carries key highway and rail lines linking the state’s Central Valley with Nevada and the broader interior West.
-
B.
Tioga Pass corridor (eastern approach to Yosemite)
The Tioga Pass corridor is a high-elevation scenic route on the eastern approach to Yosemite National Park, known for its dramatic Sierra Nevada landscapes, alpine lakes, and access to hiking and climbing areas.
-
C.
Ebbetts Pass
Ebbetts Pass is a high mountain pass in California’s Sierra Nevada, known for its scenic, winding route and historic role as a trans-Sierra crossing.
-
D.
Tehachapi Pass
Tehachapi Pass is a major mountain pass in Southern California that serves as a key transportation corridor between the San Joaquin Valley and the Mojave Desert.
-
E.
Carson Pass
Carson Pass is a high mountain pass in California’s central Sierra Nevada, known for its scenic alpine landscapes, hiking trails, and historic role as a route for emigrant wagon trains.
- 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 in the Sierra Nevada Target entity description: Summit Tunnel in the Sierra Nevada is a historic railroad tunnel blasted through solid granite high in California’s Sierra Nevada mountains as part of the construction of the First Transcontinental Railroad in the 1860s.
-
A.
Sierra Nevada transportation corridor
The Sierra Nevada transportation corridor is a major east–west route across California’s Sierra Nevada mountains that carries key highway and rail lines linking the state’s Central Valley with Nevada and the broader interior West.
-
B.
Tioga Pass corridor (eastern approach to Yosemite)
The Tioga Pass corridor is a high-elevation scenic route on the eastern approach to Yosemite National Park, known for its dramatic Sierra Nevada landscapes, alpine lakes, and access to hiking and climbing areas.
-
C.
Ebbetts Pass
Ebbetts Pass is a high mountain pass in California’s Sierra Nevada, known for its scenic, winding route and historic role as a trans-Sierra crossing.
-
D.
Tehachapi Pass
Tehachapi Pass is a major mountain pass in Southern California that serves as a key transportation corridor between the San Joaquin Valley and the Mojave Desert.
-
E.
Carson Pass
Carson Pass is a high mountain pass in California’s central Sierra Nevada, known for its scenic alpine landscapes, hiking trails, and historic role as a route for emigrant wagon trains.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
historic site
ⓘ
railroad tunnel ⓘ |
| alsoKnownAs |
Summit Tunnel
ⓘ
Tunnel No. 6 ⓘ
linked to:
Summit Tunnel
|
| associatedWith |
Donner Pass railroad route
ⓘ
linked to:
Southern Pacific Donner Pass line
snow sheds along the Central Pacific line ⓘ |
| climateCondition | subject to heavy Sierra Nevada snowfall ⓘ |
| constructedBy | Central Pacific Railroad ⓘ |
| constructionDifficulty | hard granite and severe winter weather ⓘ |
| constructionEndDate | 1867 ⓘ |
| constructionMethod |
black powder blasting
ⓘ
hand drilling and blasting ⓘ nitroglycerin blasting ⓘ |
| constructionStartDate | 1865 ⓘ |
| currentUse |
abandoned railroad tunnel
ⓘ
hiking destination ⓘ historic attraction ⓘ |
| designedBy | engineers of the Central Pacific Railroad ⓘ |
| elevation | approximately 7,000 feet above sea level ⓘ |
| era | American Civil War and Reconstruction era ⓘ |
| feature | vertical construction shafts used for simultaneous heading work ⓘ |
| gauge | standard gauge railroad ⓘ |
| heritage | important landmark in American railroad history ⓘ |
| historicSignificance |
key engineering obstacle in building the First Transcontinental Railroad
ⓘ
symbol of Chinese railroad workers’ contributions in the Sierra Nevada ⓘ |
| laborForce |
Chinese railroad workers
ⓘ
Irish railroad workers ⓘ |
| laterOperatedBy |
Southern Pacific Railroad
ⓘ
Union Pacific Railroad ⓘ |
| length | approximately 1,659 feet ⓘ |
| locatedIn |
California
ⓘ
linked to:
California, United States
Sierra Nevada ⓘ |
| locatedInCountry |
United States
ⓘ
linked to:
United States of America
|
| locatedInCounty |
Nevada County, California
ⓘ
Placer County, California ⓘ
linked to:
Placer County
|
| locatedNear | Donner Pass ⓘ |
| material | granite ⓘ |
| nearbyCity |
Colfax, California
ⓘ
Truckee, California ⓘ
linked to:
Truckee
|
| numberOfShafts | 4 ⓘ |
| opened | 1867 ⓘ |
| originalOwner |
Central Pacific Railroad Company
ⓘ
linked to:
Central Pacific Railroad
|
| partOf |
Central Pacific Railroad line
ⓘ
First Transcontinental Railroad ⓘ |
| railLine |
Central Pacific main line over the Sierra Nevada
ⓘ
linked to:
Central Pacific Railroad historic route
|
| status | bypassed by newer railroad alignment ⓘ |
| timeToComplete | about two years ⓘ |
| transportMode | 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 in the Sierra Nevada Description of subject: Summit Tunnel in the Sierra Nevada is a historic railroad tunnel blasted through solid granite high in California’s Sierra Nevada mountains as part of the construction of the First Transcontinental Railroad in the 1860s.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
Central Pacific line from Sacramento, California
→
notableStructure
→
Summit Tunnel (Tunnel No. 6) in the Sierra Nevada
ⓘ
linked to: Summit Tunnel in the Sierra Nevada