Triple
T4569253
| Position | Surface form | Disambiguated ID | Type / Status |
|---|---|---|---|
| Subject | Muni Metro T Third Street line |
E122988
|
entity |
| Predicate | rollingStock |
P1305
|
FINISHED |
| Object |
Muni Metro Breda LRV
The Muni Metro Breda LRV is a type of light rail vehicle used by San Francisco’s Muni Metro system for its modern streetcar and light rail services.
|
E454386
|
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: Muni Metro Breda LRV | Statement: [Muni Metro T Third Street line, rollingStock, Muni Metro Breda LRV]
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Muni Metro Breda LRV Context triple: [Muni Metro T Third Street line, rollingStock, Muni Metro Breda LRV]
-
A.
MBTA Type 9 Light Rail Vehicle
The MBTA Type 9 Light Rail Vehicle is a modern, low-floor streetcar used on Boston’s Green Line that features improved accessibility, passenger comfort, and energy efficiency compared to earlier MBTA light rail fleets.
-
B.
MBTA Type 7 Light Rail Vehicle
The MBTA Type 7 Light Rail Vehicle is a high-floor, articulated streetcar used on Boston’s Green Line, known for its distinctive design and role as one of the system’s primary light rail fleets.
-
C.
MBTA Type 8 Light Rail Vehicle
The MBTA Type 8 Light Rail Vehicle is a low-floor, articulated streetcar used on Boston’s Green Line, designed to improve accessibility and passenger capacity on the system’s light rail routes.
-
D.
Siemens U2 LRVs
Siemens U2 LRVs are a series of high-floor light rail vehicles built by Siemens for urban transit systems, widely used in early North American and European light rail networks.
-
E.
Bombardier Flexity Freedom LRVs
Bombardier Flexity Freedom LRVs are a class of modern low-floor light rail vehicles designed by Bombardier for urban transit systems in North America.
- 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: Muni Metro Breda LRV Triple: [Muni Metro T Third Street line, rollingStock, Muni Metro Breda LRV]
Generated description
The Muni Metro Breda LRV is a type of light rail vehicle used by San Francisco’s Muni Metro system for its modern streetcar and light rail services.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Muni Metro Breda LRV Target entity description: The Muni Metro Breda LRV is a type of light rail vehicle used by San Francisco’s Muni Metro system for its modern streetcar and light rail services.
-
A.
MBTA Type 9 Light Rail Vehicle
The MBTA Type 9 Light Rail Vehicle is a modern, low-floor streetcar used on Boston’s Green Line that features improved accessibility, passenger comfort, and energy efficiency compared to earlier MBTA light rail fleets.
-
B.
MBTA Type 7 Light Rail Vehicle
The MBTA Type 7 Light Rail Vehicle is a high-floor, articulated streetcar used on Boston’s Green Line, known for its distinctive design and role as one of the system’s primary light rail fleets.
-
C.
MBTA Type 8 Light Rail Vehicle
The MBTA Type 8 Light Rail Vehicle is a low-floor, articulated streetcar used on Boston’s Green Line, designed to improve accessibility and passenger capacity on the system’s light rail routes.
-
D.
Siemens U2 LRVs
Siemens U2 LRVs are a series of high-floor light rail vehicles built by Siemens for urban transit systems, widely used in early North American and European light rail networks.
-
E.
Bombardier Flexity Freedom LRVs
Bombardier Flexity Freedom LRVs are a class of modern low-floor light rail vehicles designed by Bombardier for urban transit systems in North America.
- 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_69bd46466c7081909d07f36be2d08804 |
completed | March 20, 2026, 1:06 p.m. |
| NER | Named-entity recognition | batch_69bd58a0dfbc81909b5023f0c29addaf |
completed | March 20, 2026, 2:24 p.m. |
| NED1 | Entity disambiguation (via context triple) | batch_69bdd3bf54448190a7e65cee1a5c48e3 |
completed | March 20, 2026, 11:09 p.m. |
| NEDg | Description generation | batch_69bdd9d583248190ab8e3d5b9b34bd0f |
completed | March 20, 2026, 11:35 p.m. |
| NED2 | Entity disambiguation (via description) | batch_69bdda765f18819088cacca8fae77084 |
completed | March 20, 2026, 11:38 p.m. |
Created at: March 20, 2026, 1:10 p.m.