Southern Pacific Donner Pass line
E675995
The Southern Pacific Donner Pass line is a historic and treacherous trans-Sierra Nevada railroad route in California, renowned for its steep grades, heavy snowfall, and vital role in westward rail transportation.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Donner Pass railroad route | 1 |
| Southern Pacific Donner Pass line canonical | 1 |
| Southern Pacific main line between Ogden and San Francisco | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7614832 — 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: Southern Pacific Donner Pass line Context triple: [AC-12, notableRoute, Southern Pacific Donner Pass line]
-
A.
Union Pacific West Line
The Union Pacific West Line is a commuter rail route in the Chicago metropolitan area that runs between downtown Chicago and western suburbs, providing daily passenger service as part of the Metra system.
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B.
Union Pacific North Line
The Union Pacific North Line is a Metra commuter rail line in the Chicago metropolitan area that runs north from downtown Chicago through suburbs along Lake Michigan into Kenosha, Wisconsin.
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C.
Union Pacific Moffat Subdivision
The Union Pacific Moffat Subdivision is a major railroad line in Colorado that carries freight and passenger trains through the Rocky Mountains via the historic Moffat Tunnel and surrounding mountain passes.
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D.
Union Pacific Railroad Coast Subdivision
The Union Pacific Railroad Coast Subdivision is a key rail corridor in California that carries both freight and commuter services, including trains operated by the Altamont Corridor Express.
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E.
BNSF Scenic Subdivision
The BNSF Scenic Subdivision is a major BNSF Railway line through Washington state’s Cascade Mountains, known for its steep grades, tunnels, and use by both freight and passenger 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: Southern Pacific Donner Pass line Target entity description: The Southern Pacific Donner Pass line is a historic and treacherous trans-Sierra Nevada railroad route in California, renowned for its steep grades, heavy snowfall, and vital role in westward rail transportation.
-
A.
Union Pacific West Line
The Union Pacific West Line is a commuter rail route in the Chicago metropolitan area that runs between downtown Chicago and western suburbs, providing daily passenger service as part of the Metra system.
-
B.
Union Pacific North Line
The Union Pacific North Line is a Metra commuter rail line in the Chicago metropolitan area that runs north from downtown Chicago through suburbs along Lake Michigan into Kenosha, Wisconsin.
-
C.
Union Pacific Moffat Subdivision
The Union Pacific Moffat Subdivision is a major railroad line in Colorado that carries freight and passenger trains through the Rocky Mountains via the historic Moffat Tunnel and surrounding mountain passes.
-
D.
Union Pacific Railroad Coast Subdivision
The Union Pacific Railroad Coast Subdivision is a key rail corridor in California that carries both freight and commuter services, including trains operated by the Altamont Corridor Express.
-
E.
BNSF Scenic Subdivision
The BNSF Scenic Subdivision is a major BNSF Railway line through Washington state’s Cascade Mountains, known for its steep grades, tunnels, and use by both freight and passenger trains.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
mountain railroad
ⓘ
railway line ⓘ |
| builtBy | Central Pacific Railroad NERFINISHED ⓘ |
| connects |
Reno, Nevada
NERFINISHED
ⓘ
Roseville, California NERFINISHED ⓘ |
| constructionDifficulty | tunnels blasted through granite ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| crosses | Sierra Nevada NERFINISHED ⓘ |
| engineeringSignificance | major 19th-century mountain railroad engineering project ⓘ |
| gauge | standard gauge ⓘ |
| gradeType | mountain grade ⓘ |
| hasFeature |
high elevation
ⓘ
sharp curves ⓘ |
| hasStructure |
Summit Tunnel (Tunnel 6)
NERFINISHED
ⓘ
multiple snow sheds ⓘ |
| hasSummit | Donner Summit area NERFINISHED ⓘ |
| hasWeatherChallenge | avalanches ⓘ |
| hasWeatherChallenge | blizzards ⓘ |
| heritage | considered a historic railroad route in the American West ⓘ |
| historicalOperator |
Central Pacific Railroad
NERFINISHED
ⓘ
Southern Pacific Transportation Company NERFINISHED ⓘ |
| historicalRole |
key route for westward rail transportation
ⓘ
vital route for transcontinental rail traffic ⓘ |
| importance | primary rail crossing of the central Sierra Nevada for over a century ⓘ |
| knownFor |
heavy snowfall
ⓘ
snow sheds ⓘ steep grades ⓘ treacherous operating conditions ⓘ |
| laterOwnedBy |
Southern Pacific Railroad
NERFINISHED
ⓘ
Union Pacific Railroad NERFINISHED ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
Sierra Nevada NERFINISHED ⓘ |
| openedAsPartOf | First Transcontinental Railroad NERFINISHED ⓘ |
| openedYear | 1860s ⓘ |
| operatedBy |
Southern Pacific Railroad
NERFINISHED
ⓘ
Union Pacific Railroad NERFINISHED ⓘ |
| parallelTo | Interstate 80 in parts ⓘ |
| partOf | Overland Route NERFINISHED ⓘ |
| partOfNetwork | Union Pacific Railroad network NERFINISHED ⓘ |
| passesNear |
Donner Lake
NERFINISHED
ⓘ
Truckee, California NERFINISHED ⓘ |
| region | Northern California ⓘ |
| safetyConcern | derailment risk due to snow and ice ⓘ |
| servedBy | historic transcontinental passenger trains ⓘ |
| status | active mainline (with some segments downgraded or bypassed) ⓘ |
| traverses | Donner Pass NERFINISHED ⓘ |
| usedFor |
freight transport
ⓘ
passenger 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: Southern Pacific Donner Pass line Description of subject: The Southern Pacific Donner Pass line is a historic and treacherous trans-Sierra Nevada railroad route in California, renowned for its steep grades, heavy snowfall, and vital role in westward rail transportation.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Donner Pass railroad route
this entity surface form:
Southern Pacific main line between Ogden and San Francisco