Triple
T21367114
| Position | Surface form | Disambiguated ID | Type / Status |
|---|---|---|---|
| Subject | MBTA Mattapan Line |
E526945
|
entity |
| Predicate | usesRollingStockType |
P1305
|
FINISHED |
| Object | Presidents’ Conference Committee streetcar |
—
|
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: Presidents’ Conference Committee streetcar | Statement: [MBTA Mattapan Line, usesRollingStockType, Presidents’ Conference Committee streetcar]
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Presidents’ Conference Committee streetcar Context triple: [MBTA Mattapan Line, usesRollingStockType, Presidents’ Conference Committee streetcar]
-
A.
College Street streetcar
The College Street streetcar is a Toronto Transit Commission streetcar route that runs along College Street, serving key downtown neighborhoods including the Discovery District.
-
B.
York streetcar system
The York streetcar system was a historic electric trolley network that once provided urban public transit service in York, Pennsylvania.
-
C.
Sharon streetcar system
The Sharon streetcar system was a historic electric trolley network that once served the city of Sharon, Pennsylvania and its surrounding area.
-
D.
Brill streetcar
The Brill streetcar is a historic electric tramcar model built by the J.G. Brill Company, known for its early 20th-century use in urban street railway systems and preservation in heritage streetcar fleets.
-
E.
Chester streetcar system
The Chester streetcar system was a historic electric trolley network that once provided urban public transit service in and around Chester, Pennsylvania.
- 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: Presidents’ Conference Committee streetcar Target entity description: The Presidents’ Conference Committee streetcar is a standardized, streamlined electric tram design introduced in the 1930s that became one of the most iconic and widely used streetcar types in North America.
-
A.
College Street streetcar
The College Street streetcar is a Toronto Transit Commission streetcar route that runs along College Street, serving key downtown neighborhoods including the Discovery District.
-
B.
York streetcar system
The York streetcar system was a historic electric trolley network that once provided urban public transit service in York, Pennsylvania.
-
C.
Sharon streetcar system
The Sharon streetcar system was a historic electric trolley network that once served the city of Sharon, Pennsylvania and its surrounding area.
-
D.
Brill streetcar
The Brill streetcar is a historic electric tramcar model built by the J.G. Brill Company, known for its early 20th-century use in urban street railway systems and preservation in heritage streetcar fleets.
-
E.
Chester streetcar system
The Chester streetcar system was a historic electric trolley network that once provided urban public transit service in and around Chester, Pennsylvania.
- 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_69e0b51e80808190ba5cb05667af02a9 |
completed | April 16, 2026, 10:08 a.m. |
| NER | Named-entity recognition | batch_69ee5bae5eb88190be6d9ff4dc03d52b |
completed | April 26, 2026, 6:38 p.m. |
Created at: April 16, 2026, 5:09 p.m.