Triple

T417039
Position Surface form Disambiguated ID Type / Status
Subject Illinois Prairie Path E8015 entity
Predicate followsFormerRailroad P14629 FINISHED
Object Chicago Aurora and Elgin Railroad
The Chicago Aurora and Elgin Railroad was an interurban electric railway that once connected Chicago with its western suburbs, playing a key role in regional commuter transit in the early to mid-20th century.
E55870 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: Chicago Aurora and Elgin Railroad | Statement: [Illinois Prairie Path, followsFormerRailroad, Chicago Aurora and Elgin Railroad]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07
Target entity: Chicago Aurora and Elgin Railroad
Context triple: [Illinois Prairie Path, followsFormerRailroad, Chicago Aurora and Elgin Railroad]
  • A. Chicago Railways Company
    The Chicago Railways Company was a major early 20th-century street railway operator in Chicago that formed a key part of the city’s urban transit system before consolidation into unified public transportation.
  • B. Calumet and South Chicago Railway Company
    The Calumet and South Chicago Railway Company was a street railway operator that provided transit services in Chicago’s South Side and surrounding industrial areas in the early 20th century.
  • C. Northwestern Elevated Railroad
    The Northwestern Elevated Railroad was an early elevated rapid transit line in Chicago that later became part of the city’s unified "L" system.
  • D. Pittsburgh, Cincinnati, Chicago and St. Louis Railroad
    The Pittsburgh, Cincinnati, Chicago and St. Louis Railroad was a major Midwestern and Mid-Atlantic rail system that formed a key part of the Pennsylvania Railroad’s network, linking important industrial cities across the region.
  • E. Northern Central Railway
    Northern Central Railway was a historic American railroad that operated primarily in Pennsylvania and Maryland, serving as an important north–south link in the 19th and early 20th centuries.
  • 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: Chicago Aurora and Elgin Railroad
Triple: [Illinois Prairie Path, followsFormerRailroad, Chicago Aurora and Elgin Railroad]
Generated description
The Chicago Aurora and Elgin Railroad was an interurban electric railway that once connected Chicago with its western suburbs, playing a key role in regional commuter transit in the early to mid-20th century.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07
Target entity: Chicago Aurora and Elgin Railroad
Target entity description: The Chicago Aurora and Elgin Railroad was an interurban electric railway that once connected Chicago with its western suburbs, playing a key role in regional commuter transit in the early to mid-20th century.
  • A. Chicago Railways Company
    The Chicago Railways Company was a major early 20th-century street railway operator in Chicago that formed a key part of the city’s urban transit system before consolidation into unified public transportation.
  • B. Calumet and South Chicago Railway Company
    The Calumet and South Chicago Railway Company was a street railway operator that provided transit services in Chicago’s South Side and surrounding industrial areas in the early 20th century.
  • C. Northwestern Elevated Railroad
    The Northwestern Elevated Railroad was an early elevated rapid transit line in Chicago that later became part of the city’s unified "L" system.
  • D. Pittsburgh, Cincinnati, Chicago and St. Louis Railroad
    The Pittsburgh, Cincinnati, Chicago and St. Louis Railroad was a major Midwestern and Mid-Atlantic rail system that formed a key part of the Pennsylvania Railroad’s network, linking important industrial cities across the region.
  • E. Northern Central Railway
    Northern Central Railway was a historic American railroad that operated primarily in Pennsylvania and Maryland, serving as an important north–south link in the 19th and early 20th centuries.
  • F. None of above. chosen
PD Predicate disambiguation gpt-5-mini-2025-08-07
Target predicate: followsFormerRailroad
Context triple: [Illinois Prairie Path, followsFormerRailroad, Chicago Aurora and Elgin Railroad]
  • A. servedByRailroad
    Indicates that a location or facility is provided with transportation or service by a railroad line or company.
  • B. hasRailSystem
    Indicates that an entity possesses or is served by a rail-based transportation system.
  • C. railwayCompany
    Indicates that one entity is a railway company that owns, operates, or manages railway services or infrastructure in relation to another entity.
  • D. railwayLine
    Indicates that there is a railway line connection or route associated with or passing through the referenced entity.
  • E. railroadClass
    Indicates the classification or category of a railroad according to an established system (e.g., by size, revenue, or regulatory status).
  • F. None of above. chosen

Provenance (7 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_69a2e7f1d1bc81909cf2dc9754a3c334 completed Feb. 28, 2026, 1:04 p.m.
NER Named-entity recognition batch_69a2eebde1d881908fb212bfba9d7c67 completed Feb. 28, 2026, 1:33 p.m.
NED1 Entity disambiguation (via context triple) batch_69a43e6cf1048190abf3f13ba35a3980 completed March 1, 2026, 1:26 p.m.
NEDg Description generation batch_69a43f00f8308190bd3534d3c3fde4cf completed March 1, 2026, 1:28 p.m.
NED2 Entity disambiguation (via description) batch_69a440e991408190a2b26a552fec32a8 completed March 1, 2026, 1:36 p.m.
PD Predicate disambiguation batch_69a2edd1ca148190a66bd8c5aad867d5 completed Feb. 28, 2026, 1:29 p.m.
PDg Predicate description generation batch_69a2eeb8545c8190a2b8517e7ed5b92e completed Feb. 28, 2026, 1:33 p.m.
Created at: Feb. 28, 2026, 1:11 p.m.