Union Pacific Railroad Oakland Subdivision
E423674
The Union Pacific Railroad Oakland Subdivision is a key freight and passenger rail corridor in Northern California that connects the East Bay with the Central Valley and is used by services such as the Altamont Corridor Express.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Union Pacific Railroad Oakland Subdivision canonical | 2 |
| UP Oakland Subdivision | 1 |
| Union Pacific Railroad tracks (Berkeley waterfront segment) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4235518 — 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: Union Pacific Railroad Oakland Subdivision Context triple: [Altamont Corridor Express, usesRailLine, Union Pacific Railroad Oakland Subdivision]
-
A.
Sacramento Southern Railroad
The Sacramento Southern Railroad is a heritage railway in Sacramento, California, offering excursion train rides along the Sacramento River as part of the California State Railroad Museum’s operations.
-
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 Railway, Southern Branch
The Union Pacific Railway, Southern Branch was a 19th-century rail line that later evolved into the Missouri–Kansas–Texas Railroad, helping open the American Midwest and Southwest to expanded transportation and commerce.
-
D.
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.
-
E.
BNSF Railway Monticello Subdivision
The BNSF Railway Monticello Subdivision is a freight and passenger rail corridor in Minnesota that carries BNSF trains as well as Metro Transit's Northstar commuter rail service between Minneapolis and its northwestern suburbs.
- 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: Union Pacific Railroad Oakland Subdivision Target entity description: The Union Pacific Railroad Oakland Subdivision is a key freight and passenger rail corridor in Northern California that connects the East Bay with the Central Valley and is used by services such as the Altamont Corridor Express.
-
A.
Sacramento Southern Railroad
The Sacramento Southern Railroad is a heritage railway in Sacramento, California, offering excursion train rides along the Sacramento River as part of the California State Railroad Museum’s operations.
-
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 Railway, Southern Branch
The Union Pacific Railway, Southern Branch was a 19th-century rail line that later evolved into the Missouri–Kansas–Texas Railroad, helping open the American Midwest and Southwest to expanded transportation and commerce.
-
D.
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.
-
E.
BNSF Railway Monticello Subdivision
The BNSF Railway Monticello Subdivision is a freight and passenger rail corridor in Minnesota that carries BNSF trains as well as Metro Transit's Northstar commuter rail service between Minneapolis and its northwestern suburbs.
- F. None of above. chosen
Statements (25)
| Predicate | Object |
|---|---|
| instanceOf |
freight rail corridor
ⓘ
passenger rail corridor ⓘ railway line ⓘ |
| connects |
Central Valley
NERFINISHED
ⓘ
East Bay NERFINISHED ⓘ |
| country | United States of America ⓘ |
| hasMode | rail transport ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
Northern California ⓘ |
| operator | Union Pacific Railroad NERFINISHED ⓘ |
| owner | Union Pacific Railroad NERFINISHED ⓘ |
| partOf | Union Pacific Railroad network in California NERFINISHED ⓘ |
| partOfCorridor | East Bay–Central Valley rail corridor NERFINISHED ⓘ |
| primaryFunction | freight transportation ⓘ |
| railGauge | standard gauge ⓘ |
| regionServed |
San Francisco Bay Area
ⓘ
San Joaquin Valley NERFINISHED ⓘ |
| secondaryFunction | passenger transportation ⓘ |
| usedBy |
Altamont Corridor Express
NERFINISHED
ⓘ
freight trains ⓘ passenger trains ⓘ |
| usedFor |
bulk freight transport
ⓘ
intercity passenger rail service ⓘ intermodal freight transport ⓘ regional commuter rail service ⓘ |
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: Union Pacific Railroad Oakland Subdivision Description of subject: The Union Pacific Railroad Oakland Subdivision is a key freight and passenger rail corridor in Northern California that connects the East Bay with the Central Valley and is used by services such as the Altamont Corridor Express.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Union Pacific Railroad tracks (Berkeley waterfront segment)
Oakland Amtrak station (Jack London Square)
→
railLine
→
Union Pacific Railroad Oakland Subdivision
ⓘ
this entity surface form:
UP Oakland Subdivision