Union Pacific Railroad Tracy Subdivision
E430237
The Union Pacific Railroad Tracy Subdivision is a freight and passenger rail line in California’s Central Valley and Altamont Pass area that serves as a key route for both Union Pacific operations and commuter services like the Altamont Corridor Express.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Union Pacific Railroad Tracy Subdivision canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4235521 — 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 Tracy Subdivision Context triple: [Altamont Corridor Express, usesRailLine, Union Pacific Railroad Tracy Subdivision]
-
A.
Union Pacific Railroad Niles Subdivision
The Union Pacific Railroad Niles Subdivision is a freight and passenger rail corridor in California’s East Bay and Tri-Valley region that carries both Union Pacific trains and commuter services such as the Altamont Corridor Express.
-
B.
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.
-
C.
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.
-
D.
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.
-
E.
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.
- 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 Tracy Subdivision Target entity description: The Union Pacific Railroad Tracy Subdivision is a freight and passenger rail line in California’s Central Valley and Altamont Pass area that serves as a key route for both Union Pacific operations and commuter services like the Altamont Corridor Express.
-
A.
Union Pacific Railroad Niles Subdivision
The Union Pacific Railroad Niles Subdivision is a freight and passenger rail corridor in California’s East Bay and Tri-Valley region that carries both Union Pacific trains and commuter services such as the Altamont Corridor Express.
-
B.
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.
-
C.
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.
-
D.
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.
-
E.
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.
- F. None of above. chosen
Statements (24)
| Predicate | Object |
|---|---|
| instanceOf |
railroad subdivision
ⓘ
railway line ⓘ |
| commuterService | Altamont Corridor Express NERFINISHED ⓘ |
| country | United States of America ⓘ |
| electrification | non-electrified ⓘ |
| hasFunction |
key route for Altamont Corridor Express commuter service
ⓘ
key route for Union Pacific operations ⓘ |
| locatedIn |
Altamont Pass
NERFINISHED
ⓘ
California, United States ⓘ
surface form:
California
Central Valley NERFINISHED ⓘ |
| operator | Union Pacific Railroad NERFINISHED ⓘ |
| owner | Union Pacific Railroad NERFINISHED ⓘ |
| partOfNetwork | Union Pacific Railroad network ⓘ |
| primaryTraffic |
commuter trains
ⓘ
freight trains ⓘ |
| railGauge | standard gauge ⓘ |
| railwayType | main line ⓘ |
| regionServed |
Altamont Pass area
NERFINISHED
ⓘ
California’s Central Valley NERFINISHED ⓘ |
| trafficMode | mixed freight and passenger ⓘ |
| usedBy |
Altamont Corridor Express
NERFINISHED
ⓘ
Union Pacific Railroad NERFINISHED ⓘ |
| usedFor |
freight rail transport
ⓘ
passenger 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: Union Pacific Railroad Tracy Subdivision Description of subject: The Union Pacific Railroad Tracy Subdivision is a freight and passenger rail line in California’s Central Valley and Altamont Pass area that serves as a key route for both Union Pacific operations and commuter services like the Altamont Corridor Express.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.