Peninsula rail corridor
E58161
The Peninsula rail corridor is the major rail line running through California’s San Francisco Peninsula, carrying both commuter and intercity trains between San Francisco and the South Bay.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Peninsula Corridor | 7 |
| Peninsula rail corridor canonical | 3 |
| Peninsula Corridor right-of-way | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T458792 — 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: Peninsula rail corridor Context triple: [Peninsula Commute, usedInfrastructure, Peninsula rail corridor]
-
A.
Northstar commuter rail
Northstar commuter rail is a commuter train service in the Minneapolis–Saint Paul metropolitan area that connects downtown Minneapolis with northern suburbs and exurban communities.
-
B.
Pelham Line
The Pelham Line is a New York City Subway route in the Bronx and Manhattan, operated by the IRT division and primarily served by the 6 train.
-
C.
Geneva Spur
Geneva Spur is a branch of the Illinois Prairie Path, a multi-use recreational trail in the Chicago metropolitan area.
-
D.
Amtrak Empire Corridor
The Amtrak Empire Corridor is a major passenger rail route in New York State that connects New York City with Albany and other upstate cities along the Hudson River and beyond.
-
E.
Keystone Corridor
Keystone Corridor is a major passenger rail route in Pennsylvania that connects Philadelphia with Harrisburg and other central Pennsylvania destinations.
- 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: Peninsula rail corridor Target entity description: The Peninsula rail corridor is the major rail line running through California’s San Francisco Peninsula, carrying both commuter and intercity trains between San Francisco and the South Bay.
-
A.
Northstar commuter rail
Northstar commuter rail is a commuter train service in the Minneapolis–Saint Paul metropolitan area that connects downtown Minneapolis with northern suburbs and exurban communities.
-
B.
Pelham Line
The Pelham Line is a New York City Subway route in the Bronx and Manhattan, operated by the IRT division and primarily served by the 6 train.
-
C.
Geneva Spur
Geneva Spur is a branch of the Illinois Prairie Path, a multi-use recreational trail in the Chicago metropolitan area.
-
D.
Amtrak Empire Corridor
The Amtrak Empire Corridor is a major passenger rail route in New York State that connects New York City with Albany and other upstate cities along the Hudson River and beyond.
-
E.
Keystone Corridor
Keystone Corridor is a major passenger rail route in Pennsylvania that connects Philadelphia with Harrisburg and other central Pennsylvania destinations.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
rail corridor
ⓘ
railway line ⓘ |
| alsoCarries |
freight trains
ⓘ
intercity passenger trains ⓘ |
| connects |
San Francisco
ⓘ
San Jose Diridon station ⓘ
surface form:
San Jose Diridon Station (via Caltrain alignment)
South Bay ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| electrification | 25 kV 60 Hz AC overhead (Caltrain electrified segments) ⓘ |
| formerOwner | Southern Pacific Railroad ⓘ |
| gauge | standard gauge ⓘ |
| hasLevelCrossings | numerous grade crossings along the Peninsula ⓘ |
| hasStation |
Millbrae station
ⓘ
surface form:
Millbrae Station
Mountain View station ⓘ
surface form:
Mountain View Station
Palo Alto station ⓘ
surface form:
Palo Alto Station
Redwood City Station ⓘ San Francisco 4th and King Street station ⓘ
surface form:
San Francisco 4th and King Street Station
San Jose Diridon station ⓘ
surface form:
San Jose Diridon Station
Santa Clara Station ⓘ Sunnyvale Station ⓘ |
| historicalUse | commuter service since late 19th century ⓘ |
| infrastructureOwner | Peninsula Corridor Joint Powers Board ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
San Francisco Peninsula ⓘ |
| owner |
Caltrain
ⓘ
surface form:
Caltrain (Peninsula Corridor Joint Powers Board)
|
| partOf |
Caltrain
ⓘ
surface form:
Caltrain system
|
| passesThrough |
San Mateo County, California
ⓘ
surface form:
San Mateo County
Santa Clara County ⓘ cities of San Francisco Peninsula ⓘ |
| primaryOperator |
Caltrain
ⓘ
surface form:
Caltrain (contracted operator for commuter service)
|
| primaryService | commuter rail ⓘ |
| regionServed |
San Francisco Bay Area
ⓘ
surface form:
Bay Area
|
| role | provides rail link between San Francisco and Silicon Valley ⓘ |
| significance | major north–south rail artery on the San Francisco Peninsula ⓘ |
| subjectOf |
Caltrain
ⓘ
surface form:
Caltrain Modernization Program
|
| terminus |
San Francisco
ⓘ
San Jose ⓘ |
| trackConfiguration | double track on most of the route ⓘ |
| transportMode | rail ⓘ |
| upgrade | electrification project for Caltrain commuter service ⓘ |
| usedBy |
Amtrak Capitol Corridor
ⓘ
surface form:
Amtrak Capitol Corridor (partly via shared approaches and connections)
Amtrak Coast Starlight ⓘ
surface form:
Amtrak Coast Starlight (via connecting trackage in the South Bay)
Caltrain ⓘ Union Pacific Railroad ⓘ
surface form:
Union Pacific Railroad (freight)
|
| usedFor | daily commuting between San Francisco and South Bay cities ⓘ |
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: Peninsula rail corridor Description of subject: The Peninsula rail corridor is the major rail line running through California’s San Francisco Peninsula, carrying both commuter and intercity trains between San Francisco and the South Bay.
Referenced by (11)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Peninsula Corridor right-of-way
this entity surface form:
Peninsula Corridor
this entity surface form:
Peninsula Corridor
this entity surface form:
Peninsula Corridor
this entity surface form:
Peninsula Corridor
subject surface form:
Broadway station (Caltrain)
this entity surface form:
Peninsula Corridor
this entity surface form:
Peninsula Corridor
this entity surface form:
Peninsula Corridor