Triple
T18514795
| Position | Surface form | Disambiguated ID | Type / Status |
|---|---|---|---|
| Subject | Mount Tamalpais Scenic Railway |
E452430
|
entity |
| Predicate | owner |
P347
|
FINISHED |
| Object | Mount Tamalpais and Muir Woods Railway Company |
—
|
NE NERFINISHED |
How this triple was built (3 steps)
Every LLM step that produced this triple, in pipeline order — named-entity classification, the disambiguation choices (the exact options shown, with the pick highlighted), and the generated description. The batch + timestamp of each is in the Provenance table below.
NER
Named-entity recognition
gpt-5-mini
Instruction
Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).
Input
Phrase: Mount Tamalpais and Muir Woods Railway Company | Statement: [Mount Tamalpais Scenic Railway, owner, Mount Tamalpais and Muir Woods Railway Company]
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Mount Tamalpais and Muir Woods Railway Company Context triple: [Mount Tamalpais Scenic Railway, owner, Mount Tamalpais and Muir Woods Railway Company]
-
A.
Mount Tamalpais Scenic Railway
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.
-
B.
Redwood Valley Railway
Redwood Valley Railway is a miniature live steam railroad in Tilden Regional Park that offers scenic train rides through the Berkeley Hills.
-
C.
Yosemite Mountain Sugar Pine Railroad
Yosemite Mountain Sugar Pine Railroad is a historic narrow-gauge tourist railway near Yosemite National Park that offers scenic steam train rides through the Sierra Nevada forest.
-
D.
Niles Canyon Railway
Niles Canyon Railway is a historic heritage railroad in California that offers scenic train rides through Niles Canyon using vintage locomotives and cars.
-
E.
Sierra Railway of California
The Sierra Railway of California is a historic short-line railroad famed for serving the Gold Country region and for its frequent use as a filming location in Western movies and television shows.
- 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 and Muir Woods Railway Company Target entity description: Mount Tamalpais and Muir Woods Railway Company was the firm that operated the historic scenic railway serving California’s Mount Tamalpais and nearby Muir Woods in the early 20th century.
-
A.
Mount Tamalpais Scenic Railway
chosen
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.
-
B.
Redwood Valley Railway
Redwood Valley Railway is a miniature live steam railroad in Tilden Regional Park that offers scenic train rides through the Berkeley Hills.
-
C.
Yosemite Mountain Sugar Pine Railroad
Yosemite Mountain Sugar Pine Railroad is a historic narrow-gauge tourist railway near Yosemite National Park that offers scenic steam train rides through the Sierra Nevada forest.
-
D.
Niles Canyon Railway
Niles Canyon Railway is a historic heritage railroad in California that offers scenic train rides through Niles Canyon using vintage locomotives and cars.
-
E.
Sierra Railway of California
The Sierra Railway of California is a historic short-line railroad famed for serving the Gold Country region and for its frequent use as a filming location in Western movies and television shows.
- F. None of above.
Provenance (2 batches)
The batch behind each pipeline step, in order, with when it ran. Timestamps are batch-level — stages were processed in waves, so the object chain (NER → NED1 → NEDg → NED2) reads in order, but predicate / elicitation batches can sit in a different wave.
| Step | Stage | Batch ID | Status | When |
|---|---|---|---|---|
| creating | Elicitation | batch_69d8d386df84819092355ebb260d848e |
completed | April 10, 2026, 10:40 a.m. |
| NER | Named-entity recognition | batch_69e53349415c8190b989b536e2d1c40a |
completed | April 19, 2026, 7:55 p.m. |
Created at: April 10, 2026, 11:36 a.m.