Triple

T17069340
Position Surface form Disambiguated ID Type / Status
Subject Union Pacific Heritage Fleet E414171 entity
Predicate heritageLocomotive P125202 FINISHED
Object Union Pacific 844
Union Pacific 844 is a preserved 4-8-4 steam locomotive famed as the last steam engine delivered to Union Pacific and now used on excursion and heritage trains.
E1258858 NE FINISHED

How this triple was built (5 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: Union Pacific 844 | Statement: [Union Pacific Heritage Fleet, heritageLocomotive, Union Pacific 844]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07
Target entity: Union Pacific 844
Context triple: [Union Pacific Heritage Fleet, heritageLocomotive, Union Pacific 844]
  • A. Union Pacific 6936
    Union Pacific 6936 is a preserved Union Pacific DDA40X "Centennial" diesel-electric locomotive, notable as the last of its kind to remain operational and used for special excursion and heritage trains.
  • B. Union Pacific 3985
    Union Pacific 3985 is a famous Challenger-type articulated steam locomotive built in 1943 for the Union Pacific Railroad and later restored for excursion service as one of the largest operating steam locomotives in the world.
  • C. 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.
  • D. Union Pacific 4014
    Union Pacific 4014, known as "Big Boy," is one of the largest and most powerful steam locomotives ever built, restored to operation for excursion service in the 21st century.
  • E. Union Pacific E9B 963B
    Union Pacific E9B 963B is a preserved E9B-series diesel locomotive unit that operates as part of Union Pacific’s Heritage Fleet on special excursion and ceremonial trains.
  • 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: Union Pacific 844
Triple: [Union Pacific Heritage Fleet, heritageLocomotive, Union Pacific 844]
Generated description
Union Pacific 844 is a preserved 4-8-4 steam locomotive famed as the last steam engine delivered to Union Pacific and now used on excursion and heritage trains.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07
Target entity: Union Pacific 844
Target entity description: Union Pacific 844 is a preserved 4-8-4 steam locomotive famed as the last steam engine delivered to Union Pacific and now used on excursion and heritage trains.
  • A. Union Pacific 6936
    Union Pacific 6936 is a preserved Union Pacific DDA40X "Centennial" diesel-electric locomotive, notable as the last of its kind to remain operational and used for special excursion and heritage trains.
  • B. Union Pacific 3985
    Union Pacific 3985 is a famous Challenger-type articulated steam locomotive built in 1943 for the Union Pacific Railroad and later restored for excursion service as one of the largest operating steam locomotives in the world.
  • C. 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.
  • D. Union Pacific 4014
    Union Pacific 4014, known as "Big Boy," is one of the largest and most powerful steam locomotives ever built, restored to operation for excursion service in the 21st century.
  • E. Union Pacific E9B 963B
    Union Pacific E9B 963B is a preserved E9B-series diesel locomotive unit that operates as part of Union Pacific’s Heritage Fleet on special excursion and ceremonial trains.
  • F. None of above. chosen
PD Predicate disambiguation gpt-5-mini-2025-08-07
Target predicate: heritageLocomotive
Context triple: [Union Pacific Heritage Fleet, heritageLocomotive, Union Pacific 844]
  • A. preservedLocomotive
    Indicates that a locomotive has been retained and maintained, typically in a museum or heritage setting, rather than being scrapped or left to deteriorate.
  • B. notableRollingStock chosen
    Indicates that there is a notable or historically significant piece of rolling stock (such as a train car or locomotive) associated with the subject.
  • C. usedLocomotives
    Indicates that an entity employed locomotives as tools, resources, or means to perform an action or fulfill a function.
  • D. railwayHeritageFeature
    Indicates that something is a feature associated with railway heritage, such as historically significant railway structures, equipment, or related elements.
  • E. laterLocomotiveType
    Indicates that one locomotive type succeeds or comes after another in time, representing a later development or version in locomotive design.
  • F. None of above.

Provenance (6 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_69d886cef44c8190ba56c44b4e863e64 completed April 10, 2026, 5:12 a.m.
NER Named-entity recognition batch_69e3dbbfb1f08190807301ff6e573cf5 completed April 18, 2026, 7:30 p.m.
NED1 Entity disambiguation (via context triple) batch_6a0170df4d1c81909dd05abfd1cfc2ac completed May 11, 2026, 6:02 a.m.
NEDg Description generation batch_6a0172a34194819094c290be86ec0e7e completed May 11, 2026, 6:09 a.m.
NED2 Entity disambiguation (via description) batch_6a01732467408190b78c32296e20b55f completed May 11, 2026, 6:11 a.m.
PD Predicate disambiguation batch_69e35d642f74819098c014135e249b27 completed April 18, 2026, 10:31 a.m.
Created at: April 10, 2026, 5:34 a.m.