Old Railroad Grade
E121913
Old Railroad Grade is a popular multi-use trail on Mount Tamalpais in Marin County, California, following the former route of the historic Mount Tamalpais Scenic Railway.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Old Railroad Grade canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1061133 — 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: Old Railroad Grade Context triple: [Mount Tamalpais State Park, contains, Old Railroad Grade]
-
A.
Overseas Railroad (historic)
The Overseas Railroad was an early 20th-century extension of the Florida East Coast Railway that famously connected mainland Florida to Key West via a series of long bridges across the Florida Keys.
-
B.
Pan Handle Railway
The Pan Handle Railway was a 19th-century American railroad whose lines later became part of the Pittsburgh, Cincinnati, Chicago and St. Louis Railroad system.
-
C.
Adirondack Scenic Railroad (historic)
Adirondack Scenic Railroad (historic) was a heritage railway that operated tourist excursions through New York’s Adirondack Mountains, showcasing the region’s scenic landscapes and railroad history.
-
D.
Kelso Depot
Kelso Depot is a historic former railroad station and visitor center in California’s Mojave Desert, notable for its Spanish Mission Revival architecture and role in serving travelers and workers along the Union Pacific Railroad.
-
E.
Irondale rail yard
Irondale rail yard is a major freight rail facility in Irondale, Alabama, serving as a key hub for train operations, switching, and cargo handling in the region.
- 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: Old Railroad Grade Target entity description: Old Railroad Grade is a popular multi-use trail on Mount Tamalpais in Marin County, California, following the former route of the historic Mount Tamalpais Scenic Railway.
-
A.
Overseas Railroad (historic)
The Overseas Railroad was an early 20th-century extension of the Florida East Coast Railway that famously connected mainland Florida to Key West via a series of long bridges across the Florida Keys.
-
B.
Pan Handle Railway
The Pan Handle Railway was a 19th-century American railroad whose lines later became part of the Pittsburgh, Cincinnati, Chicago and St. Louis Railroad system.
-
C.
Adirondack Scenic Railroad (historic)
Adirondack Scenic Railroad (historic) was a heritage railway that operated tourist excursions through New York’s Adirondack Mountains, showcasing the region’s scenic landscapes and railroad history.
-
D.
Kelso Depot
Kelso Depot is a historic former railroad station and visitor center in California’s Mojave Desert, notable for its Spanish Mission Revival architecture and role in serving travelers and workers along the Union Pacific Railroad.
-
E.
Irondale rail yard
Irondale rail yard is a major freight rail facility in Irondale, Alabama, serving as a key hub for train operations, switching, and cargo handling in the region.
- F. None of above. chosen
Statements (40)
| Predicate | Object |
|---|---|
| instanceOf |
multi-use trail
ⓘ
recreational trail ⓘ |
| accessibleFrom | Mill Valley, California ⓘ |
| connectsTo | other Mount Tamalpais trails ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| county | Marin County ⓘ |
| followsRouteOf | Mount Tamalpais Scenic Railway ⓘ |
| hasDifficulty | moderate ⓘ |
| hasFeature |
gradual grade
ⓘ
historic railroad alignment ⓘ |
| hasHistoricalOrigin | conversion of former railroad grade ⓘ |
| hasHistoricalSignificance | remnant of Mount Tamalpais Scenic Railway ⓘ |
| hasNearbyCity | Mill Valley, California ⓘ |
| hasNearbyLandmark | Mount Tamalpais summit ⓘ |
| hasRecreationType |
non-motorized use
ⓘ
outdoor recreation ⓘ |
| hasScenery |
San Francisco Bay views
ⓘ
coastal hills ⓘ redwood forests ⓘ |
| hasTerrain | mountain slope ⓘ |
| hasUse |
hiking
ⓘ
mountain biking ⓘ running ⓘ walking ⓘ |
| historicalUse | railroad route ⓘ |
| isManagedAs | park trail ⓘ |
| isOpenTo | public ⓘ |
| isPopularFor |
recreation
ⓘ
scenic views ⓘ |
| isRailTrail | true ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
Marin County ⓘ
surface form:
Marin County, California
Mount Tamalpais State Park ⓘ
surface form:
Mount Tamalpais
United States of America ⓘ
surface form:
United States
|
| namedAfter | former railroad grade ⓘ |
| partOf |
Mount Tamalpais State Park
ⓘ
surface form:
Mount Tamalpais trail system
|
| state |
California, United States
ⓘ
surface form:
California
|
| surfaceType | dirt ⓘ |
| traverses | Mount Tamalpais State Park ⓘ |
| usesFormerInfrastructureOf | Mount Tamalpais Scenic Railway ⓘ |
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: Old Railroad Grade Description of subject: Old Railroad Grade is a popular multi-use trail on Mount Tamalpais in Marin County, California, following the former route of the historic Mount Tamalpais Scenic Railway.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.