Sonoma–Marin Area Rail Transit
E177135
Sonoma–Marin Area Rail Transit is a commuter rail system in California’s North Bay that provides passenger service along the Highway 101 corridor in Sonoma and Marin counties.
All labels observed (4)
How this entity was disambiguated
This entity first appeared as the object of triple T1292813 — 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: Sonoma–Marin Area Rail Transit Context triple: [Santa Rosa, California, servedByRail, Sonoma–Marin Area Rail Transit]
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A.
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.
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B.
Altamont Corridor Express
Altamont Corridor Express is a commuter rail service in Northern California that connects Central Valley communities with the San Francisco Bay Area.
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C.
Sonoma County Transit
Sonoma County Transit is the primary public bus system serving communities throughout Sonoma County in Northern California.
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D.
BART Antioch–SFO+Millbrae line
The BART Antioch–SFO+Millbrae line is a Bay Area Rapid Transit service that runs between Antioch in the East Bay and San Francisco International Airport and Millbrae, connecting suburban communities with major regional transit hubs.
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E.
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.
- 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: Sonoma–Marin Area Rail Transit Target entity description: Sonoma–Marin Area Rail Transit is a commuter rail system in California’s North Bay that provides passenger service along the Highway 101 corridor in Sonoma and Marin counties.
-
A.
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.
-
B.
Altamont Corridor Express
Altamont Corridor Express is a commuter rail service in Northern California that connects Central Valley communities with the San Francisco Bay Area.
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C.
Sonoma County Transit
Sonoma County Transit is the primary public bus system serving communities throughout Sonoma County in Northern California.
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D.
BART Antioch–SFO+Millbrae line
The BART Antioch–SFO+Millbrae line is a Bay Area Rapid Transit service that runs between Antioch in the East Bay and San Francisco International Airport and Millbrae, connecting suburban communities with major regional transit hubs.
-
E.
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.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
commuter rail system
ⓘ
passenger rail service ⓘ public transit agency ⓘ |
| connectsWith |
Golden Gate Transit
ⓘ
Marin Transit ⓘ San Francisco Bay Ferry ⓘ Sonoma County Transit ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| electrification | not electrified ⓘ |
| fareSystem | zone-based fare system ⓘ |
| followsCorridor | U.S. Route 101 ⓘ |
| fundingSource |
federal funding
ⓘ
local sales tax ⓘ state funding ⓘ |
| governingBody |
Sonoma–Marin Area Rail Transit
self-linksurface differs
ⓘ
surface form:
Sonoma–Marin Area Rail Transit District Board of Directors
|
| hasAbbreviation | SMART ⓘ |
| hasLineType | regional rail line ⓘ |
| hasLocale |
Marin County
ⓘ
surface form:
Marin County, California
Sonoma County, California ⓘ |
| hasService |
ADA-accessible stations
ⓘ
bicycle-friendly trains ⓘ |
| hasServicePattern |
weekday commuter service
ⓘ
weekend service ⓘ |
| hasWebsite | https://www.sonomamarintrain.org/ ⓘ |
| headquartersLocation | Petaluma, California ⓘ |
| inception | 2017 ⓘ |
| locatedInMetropolitanArea | San Francisco Bay Area ⓘ |
| modeOfTransport | rail ⓘ |
| operator |
Sonoma–Marin Area Rail Transit
self-linksurface differs
ⓘ
surface form:
Sonoma–Marin Area Rail Transit District
|
| owner |
Sonoma–Marin Area Rail Transit
self-linksurface differs
ⓘ
surface form:
Sonoma–Marin Area Rail Transit District
|
| primaryServiceType | commuter rail ⓘ |
| propulsionSystem | diesel multiple unit ⓘ |
| purpose |
provide alternative to automobile commuting
ⓘ
reduce traffic congestion along Highway 101 corridor ⓘ |
| railwaySignalling | modern signal system ⓘ |
| safetySystem | positive train control ⓘ |
| servesCounty |
Marin County
ⓘ
Sonoma County, California ⓘ
surface form:
Sonoma County
|
| servesRegion | North Bay ⓘ |
| serviceArea | Highway 101 corridor in Sonoma and Marin counties ⓘ |
| startOfPassengerService | 2017 ⓘ |
| state |
California, United States
ⓘ
surface form:
California
|
| ticketingMethod |
clippers card acceptance
ⓘ
ticket vending machines at stations ⓘ |
| trackGauge | standard gauge ⓘ |
| usesRollingStockType | diesel multiple unit ⓘ |
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: Sonoma–Marin Area Rail Transit Description of subject: Sonoma–Marin Area Rail Transit is a commuter rail system in California’s North Bay that provides passenger service along the Highway 101 corridor in Sonoma and Marin counties.
Referenced by (15)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Santa Rosa, California
this entity surface form:
SMART (Sonoma–Marin Area Rail Transit)
this entity surface form:
SMART (Sonoma–Marin Area Rail Transit)
Sonoma–Marin Area Rail Transit
→
operator
→
Sonoma–Marin Area Rail Transit
self-linksurface differs
ⓘ
this entity surface form:
Sonoma–Marin Area Rail Transit District
Sonoma–Marin Area Rail Transit
→
governingBody
→
Sonoma–Marin Area Rail Transit
self-linksurface differs
ⓘ
this entity surface form:
Sonoma–Marin Area Rail Transit District Board of Directors
this entity surface form:
Sonoma–Marin Area Rail Transit District
subject surface form:
Novato, California
this entity surface form:
Sonoma–Marin Area Rail Transit District
this entity surface form:
Sonoma–Marin Area Rail Transit District