Triple

T1295278
Position Surface form Disambiguated ID Type / Status
Subject Metra BNSF Railway Line E27639 entity
Predicate usesRailroadSubdivision P15040 FINISHED
Object BNSF Chicago Subdivision
The BNSF Chicago Subdivision is a major freight and commuter rail corridor in the Chicago area operated by BNSF Railway, forming a key part of the region’s rail network.
E27639 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: BNSF Chicago Subdivision | Statement: [Metra BNSF Railway Line, usesRailroadSubdivision, BNSF Chicago Subdivision]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07
Target entity: BNSF Chicago Subdivision
Context triple: [Metra BNSF Railway Line, usesRailroadSubdivision, BNSF Chicago Subdivision]
  • A. Metra BNSF Railway Line
    The Metra BNSF Railway Line is a major Chicago-area commuter rail route running between Chicago Union Station and Aurora, Illinois, primarily along tracks owned by BNSF Railway.
  • B. St. Louis–San Francisco Railway
    The St. Louis–San Francisco Railway, commonly known as the Frisco, was a major American railroad that operated in the central and south-central United States from the late 19th to the mid-20th century.
  • C. Rock Island District main line
    The Rock Island District main line is a primary Metra commuter rail route in the Chicago area, running between downtown Chicago and its southwestern suburbs.
  • D. Metra Union Pacific North Line
    The Metra Union Pacific North Line is a commuter rail line in the Chicago metropolitan area that runs between downtown Chicago and its northern suburbs along the Union Pacific Railroad’s North Line.
  • E. CSX RF&P Subdivision
    The CSX RF&P Subdivision is a major CSX Transportation rail line in Virginia that forms part of the busy freight and passenger corridor linking Washington, D.C. with Richmond and points south.
  • 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: BNSF Chicago Subdivision
Triple: [Metra BNSF Railway Line, usesRailroadSubdivision, BNSF Chicago Subdivision]
Generated description
The BNSF Chicago Subdivision is a major freight and commuter rail corridor in the Chicago area operated by BNSF Railway, forming a key part of the region’s rail network.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07
Target entity: BNSF Chicago Subdivision
Target entity description: The BNSF Chicago Subdivision is a major freight and commuter rail corridor in the Chicago area operated by BNSF Railway, forming a key part of the region’s rail network.
  • A. Metra BNSF Railway Line chosen
    The Metra BNSF Railway Line is a major Chicago-area commuter rail route running between Chicago Union Station and Aurora, Illinois, primarily along tracks owned by BNSF Railway.
  • B. St. Louis–San Francisco Railway
    The St. Louis–San Francisco Railway, commonly known as the Frisco, was a major American railroad that operated in the central and south-central United States from the late 19th to the mid-20th century.
  • C. Rock Island District main line
    The Rock Island District main line is a primary Metra commuter rail route in the Chicago area, running between downtown Chicago and its southwestern suburbs.
  • D. Metra Union Pacific North Line
    The Metra Union Pacific North Line is a commuter rail line in the Chicago metropolitan area that runs between downtown Chicago and its northern suburbs along the Union Pacific Railroad’s North Line.
  • E. CSX RF&P Subdivision
    The CSX RF&P Subdivision is a major CSX Transportation rail line in Virginia that forms part of the busy freight and passenger corridor linking Washington, D.C. with Richmond and points south.
  • F. None of above.
PD Predicate disambiguation gpt-5-mini-2025-08-07
Target predicate: usesRailroadSubdivision
Context triple: [Metra BNSF Railway Line, usesRailroadSubdivision, BNSF Chicago Subdivision]
  • A. railwayDivision
    Indicates that one administrative railway division is responsible for, manages, or encompasses another railway unit, line, or area within a rail network.
  • B. servedByRailroad
    Indicates that a location or facility is provided with transportation or service by a railroad line or company.
  • C. usesRailInfrastructureOf chosen
    Indicates that one entity operates on, accesses, or otherwise makes use of the rail infrastructure owned or managed by another entity.
  • D. hasRailwayZone
    Indicates that a location or railway entity falls under the jurisdiction or coverage area of a specific railway zone.
  • E. railroadCodeFor
    Indicates that a specific railroad code is assigned to or used to identify a particular railroad entity.
  • 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_69a496d6682881909ba658f1c1e0e2b0 completed March 1, 2026, 7:43 p.m.
NER Named-entity recognition batch_69a4c3bb3a9c81909db2ad91defd87b6 completed March 1, 2026, 10:54 p.m.
NED1 Entity disambiguation (via context triple) batch_69acb300d3a0819081a9d19ea1fbdfe2 completed March 7, 2026, 11:21 p.m.
NEDg Description generation batch_69acb370c7cc81908a78bb5438416db6 completed March 7, 2026, 11:23 p.m.
NED2 Entity disambiguation (via description) batch_69acb409b4d0819081266cf3e6c09164 completed March 7, 2026, 11:26 p.m.
PD Predicate disambiguation batch_69a4bee64d908190b6a9bb479959d523 completed March 1, 2026, 10:34 p.m.
Created at: March 1, 2026, 7:51 p.m.