BART Blue Line
E582310
The BART Blue Line is a Bay Area Rapid Transit service route that runs through San Francisco and the greater Bay Area, connecting key urban centers and regional destinations.
All labels observed (4)
How this entity was disambiguated
This entity first appeared as the object of triple T6046761 — 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: BART Blue Line Context triple: [Civic Center/UN Plaza station, hasService, BART Blue Line]
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A.
BART Green Line
The BART Green Line is a Bay Area Rapid Transit service route that operates trains through the South Bay, including stops such as Berryessa/North San José station.
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B.
BART Orange Line
The BART Orange Line is a Bay Area Rapid Transit service route that runs through the East Bay and South Bay, connecting cities such as Richmond, Oakland, and San José.
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C.
BART Red Line
The BART Red Line is a Bay Area Rapid Transit service route that runs through San Francisco and connects key destinations including downtown San Francisco, Oakland, and other parts of the Bay Area.
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D.
BART Yellow Line
The BART Yellow Line is a Bay Area Rapid Transit route that runs through key stations including Civic Center/UN Plaza, connecting San Francisco with the East Bay and beyond.
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E.
BART Fremont line
The BART Fremont line is a Bay Area Rapid Transit route in the San Francisco Bay Area that historically extended service to the city of Fremont in southern Alameda County.
- 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: BART Blue Line Target entity description: The BART Blue Line is a Bay Area Rapid Transit service route that runs through San Francisco and the greater Bay Area, connecting key urban centers and regional destinations.
-
A.
BART Green Line
The BART Green Line is a Bay Area Rapid Transit service route that operates trains through the South Bay, including stops such as Berryessa/North San José station.
-
B.
BART Orange Line
The BART Orange Line is a Bay Area Rapid Transit service route that runs through the East Bay and South Bay, connecting cities such as Richmond, Oakland, and San José.
-
C.
BART Red Line
The BART Red Line is a Bay Area Rapid Transit service route that runs through San Francisco and connects key destinations including downtown San Francisco, Oakland, and other parts of the Bay Area.
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D.
BART Yellow Line
The BART Yellow Line is a Bay Area Rapid Transit route that runs through key stations including Civic Center/UN Plaza, connecting San Francisco with the East Bay and beyond.
-
E.
BART Fremont line
The BART Fremont line is a Bay Area Rapid Transit route in the San Francisco Bay Area that historically extended service to the city of Fremont in southern Alameda County.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
BART service route
ⓘ
rapid transit service ⓘ |
| connectsKeyDestinations |
downtown Oakland
ⓘ
downtown San Francisco ⓘ regional employment centers ⓘ residential suburbs ⓘ |
| connectsTo |
AC Transit
ⓘ
linked to:
Alameda-Contra Costa Transit District
BART Green Line ⓘ BART Orange Line ⓘ BART Red Line ⓘ BART Yellow Line ⓘ Caltrain ⓘ Golden Gate Transit ⓘ SamTrans ⓘ San Francisco Municipal Railway (Muni) ⓘ
linked to:
San Francisco Muni
VTA ⓘ
linked to:
VTA light rail
regional bus services ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| electrification | third rail ⓘ |
| fareMedium |
Clipper card
ⓘ
paper ticket (legacy/limited use) ⓘ |
| fareSystem | distance-based fare ⓘ |
| hasFeature |
accessible stations
ⓘ
automated train control ⓘ bicycle access (varies by station) ⓘ high-platform stations ⓘ |
| locatedIn | San Francisco Bay Area ⓘ |
| mode | rail ⓘ |
| operator |
Bay Area Rapid Transit
ⓘ
linked to:
BART
|
| owner | Bay Area Rapid Transit District ⓘ |
| partOfNetwork |
Bay Area Rapid Transit system
ⓘ
linked to:
BART
|
| publicTransportSystem | BART ⓘ |
| servesCity |
Berkeley
ⓘ
Daly City ⓘ Millbrae ⓘ Oakland ⓘ San Bruno ⓘ San Francisco ⓘ San Mateo ⓘ South San Francisco ⓘ |
| servesFunction |
commuter transport
ⓘ
regional connectivity ⓘ |
| servesRegion |
East Bay
ⓘ
San Francisco Peninsula ⓘ |
| state |
California
ⓘ
linked to:
California, United States
|
| trackGauge | broad gauge ⓘ |
| transitType | heavy 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: BART Blue Line Description of subject: The BART Blue Line is a Bay Area Rapid Transit service route that runs through San Francisco and the greater Bay Area, connecting key urban centers and regional destinations.
Referenced by (11)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
Civic Center/UN Plaza BART station
Fruitvale BART station
→
lineServed
→
BART Blue Line (Dublin/Pleasanton–Daly City) via Bay Fair (historical/peak patterns may vary)
ⓘ
linked to: BART Blue Line
linked to: BART Blue Line
linked to: BART Blue Line
linked to: BART Blue Line
subject linked to:
Bay Fair BART station
linked to: BART Blue Line