Triple

T16194274
Position Surface form Disambiguated ID Type / Status
Subject Union Pacific Challenger E393021 entity
Predicate namedAfter P63 FINISHED
Object Union Pacific Challenger steam locomotives E393021 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: Union Pacific Challenger steam locomotives | Statement: [Union Pacific Challenger, namedAfter, Union Pacific Challenger steam locomotives]

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: Union Pacific Challenger steam locomotives
Context triple: [Union Pacific Challenger, namedAfter, Union Pacific Challenger steam locomotives]
  • A. Union Pacific Big Boy class locomotives
    The Union Pacific Big Boy class locomotives were massive 4-8-8-4 articulated steam engines built for Union Pacific Railroad, famed as some of the largest and most powerful steam locomotives ever constructed.
  • B. Union Pacific Heritage Fleet
    The Union Pacific Heritage Fleet is a collection of restored historic passenger cars and locomotives maintained by Union Pacific Railroad for special excursions, public relations, and preservation of the company’s railroading legacy.
  • C. Union Pacific Challenger chosen
    The Union Pacific Challenger was a named passenger train operated by the Union Pacific Railroad, known for providing comfortable, mid-priced long-distance service across the western United States.
  • D. Southern Pacific Cab Forward locomotive
    The Southern Pacific Cab Forward locomotive is a distinctive class of steam engines with the cab placed at the front for crew safety, famously used by the Southern Pacific Railroad to haul trains through long, smoky mountain tunnels and snow sheds in the American West.
  • E. Union Pacific No. 119
    Union Pacific No. 119 was the steam locomotive that represented the Union Pacific Railroad at the 1869 Golden Spike ceremony marking the completion of the First Transcontinental Railroad.
  • 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_69d87f1e49ac8190a311b54d32990576 elicitation completed
NER batch_69e222d851188190b2452d165e4fc4bd ner completed
NED1 batch_69ffff0bfd08819083afc4bea1b99aad ned_source_triple completed
Created at: April 10, 2026, 5:02 a.m.