Triple

T17287274
Position Surface form Disambiguated ID Type / Status
Subject EMD F40PH E419690 entity
Predicate operator P179 FINISHED
Object Caltrain E1530 NE FINISHED

Named-entity recognition

Before disambiguation, gpt-5-mini classified whether the object phrase is a named entity — the step behind the object's NE type shown above.

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: Caltrain | Statement: [EMD F40PH, operator, Caltrain]

Disambiguation candidates (1 decision)

The exact options the model was shown at each disambiguation step, with the option it chose highlighted — the evidence behind this triple's disambiguated ids.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: Caltrain
Context triple: [EMD F40PH, operator, Caltrain]
  • A. Caltrain chosen
    Caltrain is a commuter rail service on the San Francisco Peninsula and in the Santa Clara Valley, connecting San Francisco to San Jose and Gilroy in California.
  • B. San Francisco (Caltrain)
    San Francisco (Caltrain) is the northern terminus and major commuter rail station of the Caltrain line serving the San Francisco Bay Area.
  • C. Sonoma–Marin Area Rail Transit
    Sonoma–Marin Area Rail Transit is a commuter rail system in California’s North Bay that provides passenger service along the Highway 101 corridor in Sonoma and Marin counties.
  • D. Altamont Corridor Express
    Altamont Corridor Express is a commuter rail service in Northern California that connects Central Valley communities with the San Francisco Bay Area.
  • E. BART Antioch–SFO+Millbrae line
    The BART Antioch–SFO+Millbrae line is a Bay Area Rapid Transit service that runs between Antioch in the East Bay and San Francisco International Airport and Millbrae, connecting suburban communities with major regional transit hubs.
  • F. None of above.
  • G. Unsure - the case is ambiguous/there is not enough information to decide.

Provenance (3 batches)

Stage Batch ID Job type Status
creating batch_69d886db32608190a61e18862c5a8af6 elicitation completed
NER batch_69e43780fad88190b82193c8335e2f11 ner completed
NED1 batch_6a017955448481909c2464a14c2a9799 ned_source_triple completed
Created at: April 10, 2026, 5:40 a.m.