Triple

T15877276
Position Surface form Disambiguated ID Type / Status
Subject CTA Yellow Line E384981 entity
Predicate previouslyUsedRollingStock P29565 FINISHED
Object CTA 6000-series railcars
The CTA 6000-series railcars were a long-serving generation of Chicago "L" rapid transit cars introduced in the mid-20th century and known for their distinctive PCC streetcar-derived design.
 E1186488 NE FINISHED

How this triple was built (4 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: CTA 6000-series railcars | Statement: [CTA Yellow Line, previouslyUsedRollingStock, CTA 6000-series railcars]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: CTA 6000-series railcars
Context triple: [CTA Yellow Line, previouslyUsedRollingStock, CTA 6000-series railcars]
  • A. CTA 2600-series railcars
    The CTA 2600-series railcars are a fleet of Chicago 'L' rapid transit cars introduced in the 1980s, known for their stainless-steel bodies and long service on multiple lines in the system.
  • B. CTA 7000-series railcars
    The CTA 7000-series railcars are a modern generation of Chicago Transit Authority rapid transit vehicles designed to replace older fleets with improved performance, accessibility, and passenger amenities.
  • C. CTA 5000-series railcars
    The CTA 5000-series railcars are a modern generation of Chicago "L" rapid transit cars featuring improved accessibility, digital signage, and enhanced passenger comfort and safety systems.
  • D. CTA 3200-series railcars
    The CTA 3200-series railcars are a fleet of Chicago "L" rapid transit cars introduced in the early 1990s, known for serving lines such as the Orange Line with modernized features compared to earlier series.
  • E. CTA 2400-series railcars
    The CTA 2400-series railcars were an earlier generation of Chicago Transit Authority rapid transit cars that served as a key workhorse of the “L” system before being succeeded by later series.
  • 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: CTA 6000-series railcars
Triple: [CTA Yellow Line, previouslyUsedRollingStock, CTA 6000-series railcars]
Generated description
The CTA 6000-series railcars were a long-serving generation of Chicago "L" rapid transit cars introduced in the mid-20th century and known for their distinctive PCC streetcar-derived design.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07 
Target entity: CTA 6000-series railcars
Target entity description: The CTA 6000-series railcars were a long-serving generation of Chicago "L" rapid transit cars introduced in the mid-20th century and known for their distinctive PCC streetcar-derived design.
  • A. CTA 2600-series railcars
    The CTA 2600-series railcars are a fleet of Chicago 'L' rapid transit cars introduced in the 1980s, known for their stainless-steel bodies and long service on multiple lines in the system.
  • B. CTA 7000-series railcars
    The CTA 7000-series railcars are a modern generation of Chicago Transit Authority rapid transit vehicles designed to replace older fleets with improved performance, accessibility, and passenger amenities.
  • C. CTA 5000-series railcars
    The CTA 5000-series railcars are a modern generation of Chicago "L" rapid transit cars featuring improved accessibility, digital signage, and enhanced passenger comfort and safety systems.
  • D. CTA 3200-series railcars
    The CTA 3200-series railcars are a fleet of Chicago "L" rapid transit cars introduced in the early 1990s, known for serving lines such as the Orange Line with modernized features compared to earlier series.
  • E. CTA 2400-series railcars
    The CTA 2400-series railcars were an earlier generation of Chicago Transit Authority rapid transit cars that served as a key workhorse of the “L” system before being succeeded by later series.
  • F. None of above. chosen

Provenance (5 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_69d86da4e86481909f1325fdc971b5ec completed April 10, 2026, 3:25 a.m.
NER Named-entity recognition batch_69e155fec9d4819081efea504e1e3952 completed April 16, 2026, 9:34 p.m.
NED1 Entity disambiguation (via context triple) batch_69ffbe6ae10081909a7d8be8cbb3aed2 completed May 9, 2026, 11:08 p.m.
NEDg Description generation batch_69ffbefd91208190809da95995554152 completed May 9, 2026, 11:10 p.m.
NED2 Entity disambiguation (via description) batch_69ffbf745f788190abae3ba723c3a564 completed May 9, 2026, 11:12 p.m.
Created at: April 10, 2026, 4:51 a.m.