Peninsula Corridor Joint Powers Board
E10436
The Peninsula Corridor Joint Powers Board is a public agency formed by Bay Area counties to oversee and manage the Caltrain commuter rail service along the San Francisco Peninsula.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Peninsula Corridor Joint Powers Board canonical | 10 |
| Caltrain Joint Powers Board | 1 |
| Peninsula Corridor Joint Powers Board (right-of-way predecessor entities) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T76633 — 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: Peninsula Corridor Joint Powers Board Context triple: [Caltrain, owner, Peninsula Corridor Joint Powers Board]
-
A.
Union Station Redevelopment Corporation
Union Station Redevelopment Corporation is a nonprofit organization responsible for managing, preserving, and overseeing the redevelopment of Washington, D.C.’s historic Union Station.
-
B.
Los Angeles County Metropolitan Transportation Authority
The Los Angeles County Metropolitan Transportation Authority is the primary public transit agency for Los Angeles County, operating and overseeing the region’s bus and rail systems.
-
C.
Southeastern Pennsylvania Transportation Authority
The Southeastern Pennsylvania Transportation Authority (SEPTA) is the regional public transit agency serving the Philadelphia metropolitan area, operating buses, subways, trolleys, and commuter rail services across southeastern Pennsylvania.
-
D.
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.
-
E.
Metropolitan Transportation Authority
The Metropolitan Transportation Authority is the public agency responsible for operating and overseeing much of the mass transit and commuter rail systems in the New York City metropolitan area.
- 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: Peninsula Corridor Joint Powers Board Target entity description: The Peninsula Corridor Joint Powers Board is a public agency formed by Bay Area counties to oversee and manage the Caltrain commuter rail service along the San Francisco Peninsula.
-
A.
Union Station Redevelopment Corporation
Union Station Redevelopment Corporation is a nonprofit organization responsible for managing, preserving, and overseeing the redevelopment of Washington, D.C.’s historic Union Station.
-
B.
Los Angeles County Metropolitan Transportation Authority
The Los Angeles County Metropolitan Transportation Authority is the primary public transit agency for Los Angeles County, operating and overseeing the region’s bus and rail systems.
-
C.
Southeastern Pennsylvania Transportation Authority
The Southeastern Pennsylvania Transportation Authority (SEPTA) is the regional public transit agency serving the Philadelphia metropolitan area, operating buses, subways, trolleys, and commuter rail services across southeastern Pennsylvania.
-
D.
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.
-
E.
Metropolitan Transportation Authority
The Metropolitan Transportation Authority is the public agency responsible for operating and overseeing much of the mass transit and commuter rail systems in the New York City metropolitan area.
- F. None of above. chosen
Statements (35)
| Predicate | Object |
|---|---|
| instanceOf |
joint powers authority
ⓘ
public agency ⓘ transit agency ⓘ |
| alsoKnownAs |
Peninsula Corridor Joint Powers Board
ⓘ
surface form:
Caltrain Joint Powers Board
PCJPB ⓘ |
| brand | Caltrain ⓘ |
| collaboratesWith |
San Francisco Muni
ⓘ
surface form:
San Francisco Municipal Transportation Agency
San Mateo County Transit District ⓘ Santa Clara Valley Transportation Authority ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| focus | passenger rail transportation ⓘ |
| governanceStructure | board of directors ⓘ |
| governs |
Peninsula rail corridor
ⓘ
surface form:
Peninsula Corridor right-of-way
|
| legalForm | joint powers authority under California law ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
San Francisco Bay Area ⓘ |
| manages | Caltrain ⓘ |
| memberJurisdiction |
San Francisco County
ⓘ
surface form:
City and County of San Francisco
San Mateo County, California ⓘ
surface form:
San Mateo County
Santa Clara County ⓘ |
| mode | rail ⓘ |
| operatesOn | San Francisco Peninsula ⓘ |
| oversees | Caltrain commuter rail service ⓘ |
| owns | Peninsula rail corridor infrastructure ⓘ |
| primaryServiceArea |
San Francisco
ⓘ
San Mateo County, California ⓘ
surface form:
San Mateo County corridor
Santa Clara Valley ⓘ |
| regionServed |
San Francisco Peninsula
ⓘ
South Bay ⓘ |
| responsibleFor |
Caltrain budgeting
ⓘ
Caltrain capital projects ⓘ Caltrain operations oversight ⓘ Caltrain planning ⓘ |
| sector | public transportation ⓘ |
| serviceType | commuter rail ⓘ |
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: Peninsula Corridor Joint Powers Board Description of subject: The Peninsula Corridor Joint Powers Board is a public agency formed by Bay Area counties to oversee and manage the Caltrain commuter rail service along the San Francisco Peninsula.
Referenced by (12)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Caltrain Joint Powers Board
this entity surface form:
Peninsula Corridor Joint Powers Board (right-of-way predecessor entities)
subject surface form:
Broadway station (Caltrain)