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
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.
E452430 NE FINISHED

How this triple was built (4 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.
NEDg Description generation gpt-5.1
Instruction
Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"
Input
Entity: Mount Tamalpais and Muir Woods Railway Company
Triple: [Mount Tamalpais Scenic Railway, owner, Mount Tamalpais and Muir Woods Railway Company]
Generated 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.
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 (5 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.
NED1 Entity disambiguation (via context triple) batch_6a04916c1cb88190889ad7d1c1dc4279 completed May 13, 2026, 2:57 p.m.
NEDg Description generation batch_6a04921b1a508190b8bb6d6c4597ab99 completed May 13, 2026, 3 p.m.
NED2 Entity disambiguation (via description) batch_6a0492ba4ea08190b59510b221ad5d21 completed May 13, 2026, 3:03 p.m.
Created at: April 10, 2026, 11:36 a.m.