Mount Tamalpais Scenic Railway
E452430
Mount Tamalpais Scenic Railway was a historic early-20th-century tourist railroad in Marin County, California, famed for its winding “Crookedest Railroad in the World” route to the summit of Mount Tamalpais.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Mount Tamalpais Scenic Railway canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T4566140 — 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: Mount Tamalpais Scenic Railway Context triple: [Old Railroad Grade, followsRouteOf, Mount Tamalpais Scenic Railway]
-
A.
Strasburg Rail Road
Strasburg Rail Road is a historic heritage railway in Pennsylvania that operates steam-powered excursion trains and is one of the oldest continuously operating railroads in the United States.
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B.
Incline Railway
Incline Railway is a historic funicular railway in Chattanooga, Tennessee, known for its steep ascent up Lookout Mountain and its popularity as a scenic tourist attraction.
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C.
Scenic Railway
Scenic Railway is a steeply inclined passenger railway in Katoomba’s Blue Mountains, famous for offering dramatic cliffside and rainforest views.
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D.
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.
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E.
Angels Flight Railway
Angels Flight Railway is a historic narrow-gauge funicular in Downtown Los Angeles that carries passengers up and down the steep Bunker Hill slope.
- 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: Mount Tamalpais Scenic Railway Target entity description: Mount Tamalpais Scenic Railway was a historic early-20th-century tourist railroad in Marin County, California, famed for its winding “Crookedest Railroad in the World” route to the summit of Mount Tamalpais.
-
A.
Strasburg Rail Road
Strasburg Rail Road is a historic heritage railway in Pennsylvania that operates steam-powered excursion trains and is one of the oldest continuously operating railroads in the United States.
-
B.
Incline Railway
Incline Railway is a historic funicular railway in Chattanooga, Tennessee, known for its steep ascent up Lookout Mountain and its popularity as a scenic tourist attraction.
-
C.
Scenic Railway
Scenic Railway is a steeply inclined passenger railway in Katoomba’s Blue Mountains, famous for offering dramatic cliffside and rainforest views.
-
D.
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.
-
E.
Angels Flight Railway
Angels Flight Railway is a historic narrow-gauge funicular in Downtown Los Angeles that carries passengers up and down the steep Bunker Hill slope.
- F. None of above. chosen
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
defunct railroad
ⓘ
mountain railway ⓘ tourist railroad ⓘ |
| associatedWith |
Mill Valley and Mount Tamalpais Scenic Railway history
ⓘ
development of Marin County as a resort destination ⓘ |
| category |
defunct California railroads
ⓘ
mountain railways in the United States ⓘ narrow-gauge railroads in California ⓘ |
| closed | 1930 ⓘ |
| constructionCompleted | 1896 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| era | early 20th century ⓘ |
| heritage | historic railroad of California ⓘ |
| historicalPeriod | Gilded Age and Progressive Era tourism ⓘ |
| impact | promoted tourism on Mount Tamalpais ⓘ |
| infrastructureType | single-track line ⓘ |
| inspired | later recreational use of Mount Tamalpais slopes ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
Marin County, California NERFINISHED ⓘ Mount Tamalpais NERFINISHED ⓘ |
| maximumGradient | approximately 7 percent ⓘ |
| nickname | Crookedest Railroad in the World NERFINISHED ⓘ |
| notableFor |
extremely winding alignment
ⓘ
mountain tourism development in Marin County ⓘ |
| opened | 1896 ⓘ |
| owner | Mount Tamalpais and Muir Woods Railway Company NERFINISHED ⓘ |
| passengerService | excursion trains ⓘ |
| primaryTraffic | sightseeing passengers ⓘ |
| primaryUse | tourism ⓘ |
| propulsion | steam ⓘ |
| regionServed | San Francisco Bay Area ⓘ |
| routeCharacteristic |
scenic views of San Francisco Bay
ⓘ
steep gradients ⓘ switchback curves ⓘ |
| servedAttraction |
Mount Tamalpais State Park area
NERFINISHED
ⓘ
Muir Woods area NERFINISHED ⓘ |
| startPoint | Mill Valley, California NERFINISHED ⓘ |
| status |
abandoned
ⓘ
dismantled ⓘ |
| successorUseOfRightOfWay | hiking trails on Mount Tamalpais ⓘ |
| terminus | summit of Mount Tamalpais ⓘ |
| trackGauge | 3 ft (914 mm) narrow gauge ⓘ |
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: Mount Tamalpais Scenic Railway Description of subject: Mount Tamalpais Scenic Railway was a historic early-20th-century tourist railroad in Marin County, California, famed for its winding “Crookedest Railroad in the World” route to the summit of Mount Tamalpais.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.