Union Pacific Railroad Martinez Subdivision
E543421
The Union Pacific Railroad Martinez Subdivision is a key freight and passenger rail corridor in Northern California that runs along the eastern shore of the San Francisco Bay and through the Carquinez Strait area.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Union Pacific Railroad Martinez Subdivision canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T5758125 — 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 Martinez Subdivision Context triple: [Emeryville station, hasRailLine, Union Pacific Railroad Martinez Subdivision]
-
A.
Union Pacific Railroad Fresno Subdivision
The Union Pacific Railroad Fresno Subdivision is a key freight and passenger rail corridor in California’s Central Valley that carries both Union Pacific trains and Altamont Corridor Express commuter services.
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B.
Union Pacific Valley Subdivision
The Union Pacific Valley Subdivision is a railroad line operated by Union Pacific that serves as a key freight corridor within its regional rail network.
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C.
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.
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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.
Union Pacific Railroad Oakland Subdivision
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.
- 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 Martinez Subdivision Target entity description: The Union Pacific Railroad Martinez Subdivision is a key freight and passenger rail corridor in Northern California that runs along the eastern shore of the San Francisco Bay and through the Carquinez Strait area.
-
A.
Union Pacific Railroad Fresno Subdivision
The Union Pacific Railroad Fresno Subdivision is a key freight and passenger rail corridor in California’s Central Valley that carries both Union Pacific trains and Altamont Corridor Express commuter services.
-
B.
Union Pacific Valley Subdivision
The Union Pacific Valley Subdivision is a railroad line operated by Union Pacific that serves as a key freight corridor within its regional rail network.
-
C.
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.
-
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.
Union Pacific Railroad Oakland Subdivision
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.
- F. None of above. chosen
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
railroad subdivision
ⓘ
railway line ⓘ |
| connectsTo |
Union Pacific Railroad Niles Subdivision
NERFINISHED
ⓘ
Union Pacific Railroad Oakland Subdivision NERFINISHED ⓘ Union Pacific Railroad Sacramento Subdivision NERFINISHED ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| crosses | Carquinez Strait NERFINISHED ⓘ |
| electrification | not electrified ⓘ |
| followedBy | Union Pacific Railroad Sacramento Subdivision NERFINISHED ⓘ |
| gauge | standard gauge ⓘ |
| hasBridge | rail bridge over Carquinez Strait near Martinez ⓘ |
| hasMajorJunctionAt |
Martinez, California
NERFINISHED
ⓘ
Oakland, California NERFINISHED ⓘ |
| hasSignaling | Centralized traffic control ⓘ |
| historicallyUsedBy | Southern Pacific Railroad NERFINISHED ⓘ |
| historicalOwner | Southern Pacific Transportation Company NERFINISHED ⓘ |
| locatedIn | Northern California ⓘ |
| operator | Union Pacific Railroad NERFINISHED ⓘ |
| parallels | Interstate 80 in California NERFINISHED ⓘ |
| partOf | Union Pacific Railroad network in California NERFINISHED ⓘ |
| partOfCorridor | Oakland–Sacramento rail corridor NERFINISHED ⓘ |
| passesThrough |
Berkeley, California
NERFINISHED
ⓘ
Emeryville, California NERFINISHED ⓘ Martinez, California NERFINISHED ⓘ Oakland, California NERFINISHED ⓘ Richmond, California NERFINISHED ⓘ |
| precededBy | Union Pacific Railroad Niles Subdivision NERFINISHED ⓘ |
| primaryTraffic |
intermodal freight
ⓘ
manifest freight ⓘ passenger corridor services ⓘ |
| regionServed |
Carquinez Strait region
ⓘ
San Francisco Bay Area ⓘ |
| runsAlong | eastern shore of San Francisco Bay ⓘ |
| runsThrough | Carquinez Strait area NERFINISHED ⓘ |
| state |
California, United States
ⓘ
surface form:
California
|
| trackConfiguration | mostly double track ⓘ |
| usedBy |
Amtrak California Zephyr
NERFINISHED
ⓘ
Amtrak Capitol Corridor NERFINISHED ⓘ Amtrak Coast Starlight NERFINISHED ⓘ Amtrak San Joaquins 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 Martinez Subdivision Description of subject: The Union Pacific Railroad Martinez Subdivision is a key freight and passenger rail corridor in Northern California that runs along the eastern shore of the San Francisco Bay and through the Carquinez Strait area.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
Amtrak Capitol Corridor at Richmond station
→
locatedOnRailLine
→
Union Pacific Railroad Martinez Subdivision
ⓘ