Key System
E675246
Key System was a privately owned mass transit company that operated streetcars, buses, and commuter trains in the San Francisco Bay Area during the first half of the 20th century.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Key System canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7583632 — 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 Context triple: [Key System Transit Lines, operatedBy, Key System]
-
A.
Key
Key is a common English surname borne by various notable individuals, including American lawyer and national anthem lyricist Francis Scott Key.
-
B.
Key Resolve
Key Resolve was an annual large-scale joint military exercise conducted by the United States and South Korea to enhance readiness and deterrence against North Korean aggression.
-
C.
System1
System1 is a digital marketing and customer acquisition company specializing in data-driven advertising and online performance-based media.
-
D.
System M
System M is the analog television broadcasting system used in NTSC countries, characterized by 525 lines per frame and a 60 Hz field rate.
-
E.
Keys
"Keys" is a double album by American singer-songwriter Alicia Keys that blends stripped-down piano-driven tracks with more fully produced versions, showcasing her versatility and evolution as an artist.
- 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 Target entity description: Key System was a privately owned mass transit company that operated streetcars, buses, and commuter trains in the San Francisco Bay Area during the first half of the 20th century.
-
A.
Key
Key is a common English surname borne by various notable individuals, including American lawyer and national anthem lyricist Francis Scott Key.
-
B.
Key Resolve
Key Resolve was an annual large-scale joint military exercise conducted by the United States and South Korea to enhance readiness and deterrence against North Korean aggression.
-
C.
System1
System1 is a digital marketing and customer acquisition company specializing in data-driven advertising and online performance-based media.
-
D.
System M
System M is the analog television broadcasting system used in NTSC countries, characterized by 525 lines per frame and a 60 Hz field rate.
-
E.
Keys
"Keys" is a double album by American singer-songwriter Alicia Keys that blends stripped-down piano-driven tracks with more fully produced versions, showcasing her versatility and evolution as an artist.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
public transit company
ⓘ
streetcar operator ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| dissolved | 1960 ⓘ |
| endDate | 1960 ⓘ |
| fareSystem | flat fare ⓘ |
| hasPart |
A line
ⓘ
B line NERFINISHED ⓘ C line NERFINISHED ⓘ E line NERFINISHED ⓘ F line NERFINISHED ⓘ G line NERFINISHED ⓘ H line NERFINISHED ⓘ transbay routes ⓘ |
| headquartersLocation | Oakland, California NERFINISHED ⓘ |
| historicalEra | first half of the 20th century ⓘ |
| locatedIn | San Francisco Bay Area ⓘ |
| networkName | Key Route System NERFINISHED ⓘ |
| notableEvent |
abandonment of rail service over Bay Bridge
ⓘ
conversion of streetcar lines to bus operation ⓘ |
| operatedBy | Key System Transit Lines NERFINISHED ⓘ |
| operatedMode |
bus
ⓘ
commuter train ⓘ |
| operatedRailType |
interurban railway
ⓘ
streetcar ⓘ |
| owner | National City Lines NERFINISHED ⓘ |
| predecessor |
Oakland Traction Company
NERFINISHED
ⓘ
San Francisco, Oakland and San Jose Railway NERFINISHED ⓘ |
| propulsionSystem | electric traction ⓘ |
| servedCity |
Alameda
NERFINISHED
ⓘ
Berkeley NERFINISHED ⓘ Oakland NERFINISHED ⓘ Piedmont NERFINISHED ⓘ San Leandro NERFINISHED ⓘ |
| servedDestination |
San Francisco
NERFINISHED
ⓘ
Transbay Terminal NERFINISHED ⓘ |
| servedRegion | East Bay NERFINISHED ⓘ |
| serviceType |
interurban transit
ⓘ
suburban transit ⓘ urban transit ⓘ |
| startDate | 1903 ⓘ |
| successor |
AC Transit
NERFINISHED
ⓘ
Bay Area Rapid Transit NERFINISHED ⓘ |
| trackGauge | standard gauge ⓘ |
| usedInfrastructure |
Bay Bridge railway tracks
NERFINISHED
ⓘ
San Francisco–Oakland Bay Bridge lower deck NERFINISHED ⓘ |
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 Description of subject: Key System was a privately owned mass transit company that operated streetcars, buses, and commuter trains in the San Francisco Bay Area during the first half of the 20th century.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.