Key System Transit Lines
E179551
Key System Transit Lines was a privately operated streetcar and bus network that once served the San Francisco Bay Area, particularly the East Bay, before being dismantled in the mid-20th century.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Key System Transit Lines canonical | 1 |
| Key System transit network | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1573560 — 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: Key System Transit Lines Context triple: [AC Transit, replaced, Key System Transit Lines]
-
A.
Transitway
Transitway is a bus rapid transit network in Ottawa, Ontario, providing high-capacity, grade-separated transit service across the city.
-
B.
Metropolitan Transit System
The Metropolitan Transit System is the primary public transportation agency serving the San Diego region, operating buses, trolleys, and related transit services.
-
C.
MetroAccess
MetroAccess is a paratransit service providing door-to-door transportation for people with disabilities in the Washington, D.C. metropolitan area.
-
D.
Metro Rail
Metro Rail is the urban rapid transit rail system serving Los Angeles County, providing light rail and subway services across the region.
-
E.
Loop transportation system
The Loop transportation system is The Boring Company’s proposed network of underground tunnels using autonomous electric vehicles to move passengers rapidly and bypass surface traffic congestion.
- 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: Key System Transit Lines Target entity description: Key System Transit Lines was a privately operated streetcar and bus network that once served the San Francisco Bay Area, particularly the East Bay, before being dismantled in the mid-20th century.
-
A.
Transitway
Transitway is a bus rapid transit network in Ottawa, Ontario, providing high-capacity, grade-separated transit service across the city.
-
B.
Metropolitan Transit System
The Metropolitan Transit System is the primary public transportation agency serving the San Diego region, operating buses, trolleys, and related transit services.
-
C.
MetroAccess
MetroAccess is a paratransit service providing door-to-door transportation for people with disabilities in the Washington, D.C. metropolitan area.
-
D.
Metro Rail
Metro Rail is the urban rapid transit rail system serving Los Angeles County, providing light rail and subway services across the region.
-
E.
Loop transportation system
The Loop transportation system is The Boring Company’s proposed network of underground tunnels using autonomous electric vehicles to move passengers rapidly and bypass surface traffic congestion.
- F. None of above. chosen
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
bus transit system
ⓘ
defunct transit operator ⓘ public transit system ⓘ streetcar system ⓘ |
| connectedTo | San Francisco, California ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| dismantledIn | mid-20th century ⓘ |
| fareSystem | local and interurban fares ⓘ |
| hadRollingStockType |
electric streetcars
ⓘ
interurban electric trains ⓘ motor buses ⓘ |
| hasMode |
bus
ⓘ
interurban rail ⓘ streetcar ⓘ |
| historicalSignificance | major pre-BART transit provider in the East Bay ⓘ |
| industry | public transportation ⓘ |
| notableFor |
East Bay streetcar network
ⓘ
rail service across the Bay Bridge ⓘ |
| operatedBy | Key System ⓘ |
| operatedIn | 20th century ⓘ |
| operatedOn | San Francisco–Oakland Bay Bridge ⓘ |
| operatedType | privately operated transit ⓘ |
| ownership | private company ⓘ |
| partOf |
Key System transit network
ⓘ
linked to:
Key System Transit Lines
|
| region | Northern California ⓘ |
| replacedBy |
AC Transit
ⓘ
Bay Area Rapid Transit ⓘ
linked to:
BART
|
| serves |
Alameda, California
ⓘ
Berkeley, California ⓘ
linked to:
Berkeley
East Bay ⓘ Oakland, California ⓘ
linked to:
Oakland
Piedmont, California ⓘ Richmond, California ⓘ San Francisco Bay Area ⓘ San Leandro, California ⓘ
linked to:
San Leandro
|
| serviceAreaCharacteristic | East Bay cities and suburbs ⓘ |
| serviceType |
suburban transit
ⓘ
urban transit ⓘ |
| status | dismantled ⓘ |
| transitionedFrom | streetcar operations ⓘ |
| transitionedTo | bus operations ⓘ |
| usedInfrastructure |
Bay Bridge rail deck
ⓘ
linked to:
Bay Bridge
|
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: Key System Transit Lines Description of subject: Key System Transit Lines was a privately operated streetcar and bus network that once served the San Francisco Bay Area, particularly the East Bay, before being dismantled in the mid-20th century.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Key System Transit Lines