Triple
T4462333
| Position | Surface form | Disambiguated ID | Type / Status |
|---|---|---|---|
| Subject | CTA 2600-series railcars |
E98283
|
entity |
| Predicate | usedOnService |
P2367
|
FINISHED |
| Object | Forest Park branch of the Blue Line |
E367335
|
NE FINISHED |
How this triple was built (2 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: Forest Park branch of the Blue Line | Statement: [CTA 2600-series railcars, usedOnService, Forest Park branch of the Blue Line]
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Forest Park branch of the Blue Line Context triple: [CTA 2600-series railcars, usedOnService, Forest Park branch of the Blue Line]
-
A.
Metra at Forest Park
Metra at Forest Park is a commuter rail station in Forest Park, Illinois, serving Metra’s Union Pacific West Line and providing regional rail connections to and from Chicago.
-
B.
Oak Park station (Blue Line)
Oak Park station (Blue Line) is an elevated Chicago Transit Authority rapid transit stop in Oak Park, Illinois, serving the Forest Park branch of the Blue Line.
-
C.
Green Line Lake Branch
The Green Line Lake Branch is a rapid transit line of the Chicago "L" system that runs west from downtown Chicago to the city's West Side and western suburbs.
-
D.
Braintree Branch of the Red Line
The Braintree Branch of the Red Line is a southern extension of Boston’s MBTA rapid transit system that runs from JFK/UMass through Quincy to Braintree, serving several South Shore communities.
-
E.
Forest Park branch
chosen
The Forest Park branch is the western segment of Chicago's CTA Blue Line rapid transit route, serving neighborhoods between downtown Chicago and the suburb of Forest Park.
- F. None of above.
- G. Unsure - the case is ambiguous/there is not enough information to decide.
Provenance (3 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_69b3454a7c608190944f5455c8031d73 |
completed | March 12, 2026, 10:59 p.m. |
| NER | Named-entity recognition | batch_69b3567716a4819092a5bc9732e74592 |
completed | March 13, 2026, 12:12 a.m. |
| NED1 | Entity disambiguation (via context triple) | batch_69b6284b90708190b557b66bd7533f4e |
completed | March 15, 2026, 3:32 a.m. |
Created at: March 12, 2026, 11:34 p.m.