AC Transit
E33595
AC Transit is a public bus agency serving the East Bay region of the San Francisco Bay Area, providing local and transbay bus services.
All labels observed (12)
How this entity was disambiguated
This entity first appeared as the object of triple T255721 — 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: AC Transit Context triple: [San Francisco Bay Area, hasPublicTransitSystem, AC Transit]
-
A.
San Francisco Muni
San Francisco Muni is the primary public transportation system in San Francisco, operating the city’s network of buses, light rail, historic streetcars, and cable cars.
-
B.
Santa Clara Valley Transportation Authority
The Santa Clara Valley Transportation Authority is the public transit agency that operates bus, light rail, and related transportation services throughout Santa Clara County in California’s Silicon Valley.
-
C.
BART
BART (Bay Area Rapid Transit) is a major rapid transit system serving the San Francisco Bay Area, linking cities like San Francisco, Oakland, and Berkeley with surrounding suburbs and regional transit networks.
-
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.
SamTrans
SamTrans is the public bus and paratransit agency serving San Mateo County and parts of the San Francisco Bay 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: AC Transit Target entity description: AC Transit is a public bus agency serving the East Bay region of the San Francisco Bay Area, providing local and transbay bus services.
-
A.
San Francisco Muni
San Francisco Muni is the primary public transportation system in San Francisco, operating the city’s network of buses, light rail, historic streetcars, and cable cars.
-
B.
Santa Clara Valley Transportation Authority
The Santa Clara Valley Transportation Authority is the public transit agency that operates bus, light rail, and related transportation services throughout Santa Clara County in California’s Silicon Valley.
-
C.
BART
BART (Bay Area Rapid Transit) is a major rapid transit system serving the San Francisco Bay Area, linking cities like San Francisco, Oakland, and Berkeley with surrounding suburbs and regional transit networks.
-
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.
SamTrans
SamTrans is the public bus and paratransit agency serving San Mateo County and parts of the San Francisco Bay Area.
- F. None of above. chosen
Statements (51)
| Predicate | Object |
|---|---|
| instanceOf |
bus operator
ⓘ
public transit agency ⓘ special district ⓘ |
| beganOperation | 1960 ⓘ |
| boardStructure | elected board of directors ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| fareIntegrationWith |
BART
ⓘ
Muni ⓘ San Francisco Bay Ferry ⓘ |
| fareSystem |
Clipper card
ⓘ
cash fares ⓘ |
| fleetType |
battery-electric buses
ⓘ
diesel buses ⓘ hybrid buses ⓘ hydrogen fuel cell buses ⓘ |
| foundingDate | 1960 ⓘ |
| fullName |
Alameda-Contra Costa Transit District
ⓘ
linked to:
AC Transit
|
| governingBody |
AC Transit Board of Directors
ⓘ
linked to:
AC Transit
|
| hasGarage |
Division 2 (Emeryville)
ⓘ
Division 3 (Richmond) ⓘ Division 4 (East Oakland) ⓘ Division 6 (Hayward) ⓘ
linked to:
Hayward
|
| headquartersLocation |
Oakland, California
ⓘ
linked to:
Oakland
|
| memberOf | Metropolitan Transportation Commission service network ⓘ |
| modeOfTransport | bus ⓘ |
| operatesInCity |
Alameda, California
ⓘ
Berkeley ⓘ Emeryville, California ⓘ Fremont, California ⓘ
linked to:
Fremont
Hayward, California ⓘ
linked to:
Hayward
Oakland ⓘ Richmond, California ⓘ San Leandro, California ⓘ
linked to:
San Leandro
|
| operatesRouteType |
All Nighter routes
ⓘ
Rapid bus routes ⓘ Transbay routes ⓘ local routes ⓘ |
| operatesTransbayTo |
San Francisco
ⓘ
San Mateo County (limited) ⓘ
linked to:
San Mateo County, California
|
| replaced | Key System Transit Lines ⓘ |
| servesCounty |
Alameda County
ⓘ
Contra Costa County ⓘ |
| servesRegion |
East Bay
ⓘ
San Francisco Bay Area ⓘ |
| serviceType |
express bus service
ⓘ
local bus service ⓘ paratransit coordination ⓘ school bus service ⓘ transbay bus service ⓘ |
| shortName | AC Transit ⓘ |
| state |
California
ⓘ
linked to:
California, United States
|
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: AC Transit Description of subject: AC Transit is a public bus agency serving the East Bay region of the San Francisco Bay Area, providing local and transbay bus services.
Referenced by (52)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
subject linked to:
Dublin/Pleasanton BART station
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
linked to: AC Transit
subject linked to:
College Avenue
linked to: AC Transit
linked to: AC Transit
subject linked to:
Civic Center Station
linked to: AC Transit
linked to: AC Transit
Millbrae Intermodal Terminal
→
serves
→
AC Transit (select transbay routes, historically/periodically)
ⓘ
linked to: AC Transit