Triple
T19253192
| Position | Surface form | Disambiguated ID | Type / Status |
|---|---|---|---|
| Subject | Illini (Amtrak) |
E481446
|
entity |
| Predicate | usesRailroad |
P522
|
FINISHED |
| Object | CN Chicago Subdivision |
—
|
NE NERFINISHED |
How this triple was built (3 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: CN Chicago Subdivision | Statement: [Illini (Amtrak), usesRailroad, CN Chicago Subdivision]
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: CN Chicago Subdivision Context triple: [Illini (Amtrak), usesRailroad, CN Chicago Subdivision]
-
A.
CN Joliet Subdivision
CN Joliet Subdivision is a Canadian National Railway freight rail line in the Joliet, Illinois area that also carries Metra’s Heritage Corridor commuter trains.
-
B.
South Chicago branch
The South Chicago branch is a commuter rail branch line in Chicago operated as part of Metra's Electric District, serving neighborhoods on the city's South Side.
-
C.
South Chicago station
South Chicago station is a Metra commuter rail terminal on Chicago’s South Side serving as the endpoint of the South Chicago branch of the Electric District line.
-
D.
South Chicago Branch of Metra Electric District
The South Chicago Branch of Metra Electric District is a commuter rail line on Chicago’s South Side that provides electric train service between downtown Chicago and the South Chicago neighborhood.
-
E.
North Chicago, Illinois
North Chicago, Illinois is an industrial and residential city in northeastern Illinois, known for hosting the Great Lakes Naval Training Center and being part of the Chicago metropolitan area.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: CN Chicago Subdivision Target entity description: The CN Chicago Subdivision is a key Canadian National Railway freight and passenger rail line in the Chicago area that forms part of an important corridor used by Amtrak services.
-
A.
CN Joliet Subdivision
CN Joliet Subdivision is a Canadian National Railway freight rail line in the Joliet, Illinois area that also carries Metra’s Heritage Corridor commuter trains.
-
B.
South Chicago branch
The South Chicago branch is a commuter rail branch line in Chicago operated as part of Metra's Electric District, serving neighborhoods on the city's South Side.
-
C.
South Chicago station
South Chicago station is a Metra commuter rail terminal on Chicago’s South Side serving as the endpoint of the South Chicago branch of the Electric District line.
-
D.
South Chicago Branch of Metra Electric District
The South Chicago Branch of Metra Electric District is a commuter rail line on Chicago’s South Side that provides electric train service between downtown Chicago and the South Chicago neighborhood.
-
E.
North Chicago, Illinois
North Chicago, Illinois is an industrial and residential city in northeastern Illinois, known for hosting the Great Lakes Naval Training Center and being part of the Chicago metropolitan area.
- F. None of above. chosen
Provenance (2 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_69d8e8cd9d1081908a181d02b88b59b8 |
completed | April 10, 2026, 12:10 p.m. |
| NER | Named-entity recognition | batch_69e5fb3339648190a87d38ce42aff016 |
completed | April 20, 2026, 10:08 a.m. |
Created at: April 10, 2026, 1:28 p.m.