Triple
T639093
| Position | Surface form | Disambiguated ID | Type / Status |
|---|---|---|---|
| Subject | Mattapan Trolley |
E16691
|
entity |
| Predicate | usesRollingStock |
P5426
|
FINISHED |
| Object |
PCC streetcar
The PCC streetcar is a standardized, streamlined electric tram design introduced in the 1930s that became one of the most widely used and influential streetcar types in North America and beyond.
|
E79857
|
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: PCC streetcar | Statement: [Mattapan Trolley, usesRollingStock, PCC streetcar]
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: PCC streetcar Context triple: [Mattapan Trolley, usesRollingStock, PCC streetcar]
-
A.
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.
-
B.
Peter Witt streetcar
The Peter Witt streetcar is a historic early 20th-century tram design, originally developed in Cleveland and widely adopted in North American and European cities for its efficient boarding layout and distinctive classic appearance.
-
C.
Portland Streetcar
Portland Streetcar is a modern urban streetcar transit system serving central Portland, Oregon, connecting key neighborhoods, employment centers, and educational institutions.
-
D.
Mattapan Trolley
The Mattapan Trolley is a historic light rail line in Boston that operates vintage PCC streetcars between Ashmont and Mattapan stations.
-
E.
O-Train
The O-Train is Ottawa’s urban rail transit system, providing light rail service across key corridors of Canada’s capital city.
- 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: PCC streetcar Triple: [Mattapan Trolley, usesRollingStock, PCC streetcar]
Generated description
The PCC streetcar is a standardized, streamlined electric tram design introduced in the 1930s that became one of the most widely used and influential streetcar types in North America and beyond.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: PCC streetcar Target entity description: The PCC streetcar is a standardized, streamlined electric tram design introduced in the 1930s that became one of the most widely used and influential streetcar types in North America and beyond.
-
A.
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.
-
B.
Peter Witt streetcar
The Peter Witt streetcar is a historic early 20th-century tram design, originally developed in Cleveland and widely adopted in North American and European cities for its efficient boarding layout and distinctive classic appearance.
-
C.
Portland Streetcar
Portland Streetcar is a modern urban streetcar transit system serving central Portland, Oregon, connecting key neighborhoods, employment centers, and educational institutions.
-
D.
Mattapan Trolley
The Mattapan Trolley is a historic light rail line in Boston that operates vintage PCC streetcars between Ashmont and Mattapan stations.
-
E.
O-Train
The O-Train is Ottawa’s urban rail transit system, providing light rail service across key corridors of Canada’s capital city.
- 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_69a4936be1c88190af56540324b57da7 |
completed | March 1, 2026, 7:28 p.m. |
| NER | Named-entity recognition | batch_69a49f00260081909d1a679182e23d10 |
completed | March 1, 2026, 8:18 p.m. |
| NED1 | Entity disambiguation (via context triple) | batch_69a574076b30819090f086b42696bb35 |
completed | March 2, 2026, 11:27 a.m. |
| NEDg | Description generation | batch_69a5748d5a4c8190b4f8fcbbae972b88 |
completed | March 2, 2026, 11:29 a.m. |
| NED2 | Entity disambiguation (via description) | batch_69a574fb37348190b0979dad87e79e53 |
completed | March 2, 2026, 11:31 a.m. |
Created at: March 1, 2026, 7:35 p.m.