Triple

T16194276
Position Surface form Disambiguated ID Type / Status
Subject Union Pacific Challenger E393021 entity
Predicate locomotiveClassUsed P31795 FINISHED
Object Union Pacific 4-6-6-4 Challenger 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 4-6-6-4 Challenger | Statement: [Union Pacific Challenger, locomotiveClassUsed, Union Pacific 4-6-6-4 Challenger]

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 4-6-6-4 Challenger
Context triple: [Union Pacific Challenger, locomotiveClassUsed, Union Pacific 4-6-6-4 Challenger]
  • A. 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.
  • B. USRA Heavy Mountain 4-8-2
    The USRA Heavy Mountain 4-8-2 was a standardized World War I–era American steam locomotive design built for heavy passenger and fast freight service, featuring a 4-8-2 wheel arrangement and robust construction for demanding mainline duties.
  • C. 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.
  • D. Atchison Topeka and Santa Fe 4-8-4 locomotive
    The Atchison, Topeka and Santa Fe 4-8-4 locomotive is a powerful steam engine from the famed Santa Fe Railway, known for hauling high-speed passenger and heavy freight trains across the American West in the mid-20th century.
  • E. Heisler locomotive
    A Heisler locomotive is a type of geared steam locomotive, recognizable by its V‑twin cylinder arrangement and used primarily on logging and industrial railroads for hauling heavy loads over steep, rough track.
  • 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_6a00078bbc388190b3fb793556ddd75a ned_source_triple completed
Created at: April 10, 2026, 5:02 a.m.