Altamont Corridor Express
E94682
Altamont Corridor Express is a commuter rail service in Northern California that connects Central Valley communities with the San Francisco Bay Area.
All labels observed (8)
How this entity was disambiguated
This entity first appeared as the object of triple T716242 — 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: Altamont Corridor Express Context triple: [Santa Clara Valley Transportation Authority, collaboratesWith, Altamont Corridor Express]
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A.
Alameda Corridor
The Alameda Corridor is a 20-mile freight rail expressway in Los Angeles County that consolidates and streamlines cargo movement between the region’s ports and the national rail network.
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B.
Caltrain
Caltrain is a commuter rail service on the San Francisco Peninsula and in the Santa Clara Valley, connecting San Francisco to San Jose and Gilroy in California.
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C.
Amtrak Capitol Corridor
Amtrak Capitol Corridor is a passenger rail service in Northern California that connects Sacramento, the San Francisco Bay Area, and San Jose with frequent, commuter-oriented trains.
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D.
Transbay Tube
The Transbay Tube is an underwater rail tunnel beneath San Francisco Bay that carries BART trains between San Francisco and Oakland.
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E.
Richmond–Millbrae line
The Richmond–Millbrae line is a Bay Area Rapid Transit (BART) service route in the San Francisco Bay Area that connects Richmond in the East Bay with Millbrae near San Francisco International Airport.
- 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: Altamont Corridor Express Target entity description: Altamont Corridor Express is a commuter rail service in Northern California that connects Central Valley communities with the San Francisco Bay Area.
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A.
Alameda Corridor
The Alameda Corridor is a 20-mile freight rail expressway in Los Angeles County that consolidates and streamlines cargo movement between the region’s ports and the national rail network.
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B.
Caltrain
Caltrain is a commuter rail service on the San Francisco Peninsula and in the Santa Clara Valley, connecting San Francisco to San Jose and Gilroy in California.
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C.
Amtrak Capitol Corridor
Amtrak Capitol Corridor is a passenger rail service in Northern California that connects Sacramento, the San Francisco Bay Area, and San Jose with frequent, commuter-oriented trains.
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D.
Transbay Tube
The Transbay Tube is an underwater rail tunnel beneath San Francisco Bay that carries BART trains between San Francisco and Oakland.
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E.
Richmond–Millbrae line
The Richmond–Millbrae line is a Bay Area Rapid Transit (BART) service route in the San Francisco Bay Area that connects Richmond in the East Bay with Millbrae near San Francisco International Airport.
- F. None of above. chosen
Statements (50)
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: Altamont Corridor Express Description of subject: Altamont Corridor Express is a commuter rail service in Northern California that connects Central Valley communities with the San Francisco Bay Area.
Referenced by (40)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Altamont Corridor Express
linked to: Altamont Corridor Express
linked to: Altamont Corridor Express
linked to: Altamont Corridor Express
linked to: Altamont Corridor Express
linked to: Altamont Corridor Express
linked to: Altamont Corridor Express
linked to: Altamont Corridor Express
linked to: Altamont Corridor Express
linked to: Altamont Corridor Express
Sacramento Valley Station
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servesRailwayLine
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Altamont Corridor Express extension to Sacramento (planned)
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linked to: Altamont Corridor Express