Triple
T7300680
| Position | Surface form | Disambiguated ID | Type / Status |
|---|---|---|---|
| Subject | MBTA Green Line C branch |
E167841
|
entity |
| Predicate | usesRollingStock |
P5426
|
FINISHED |
| Object | MBTA Type 8 LRV |
E35259
|
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: MBTA Type 8 LRV | Statement: [MBTA Green Line C branch, usesRollingStock, MBTA Type 8 LRV]
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: MBTA Type 8 LRV Context triple: [MBTA Green Line C branch, usesRollingStock, MBTA Type 8 LRV]
-
A.
MBTA Type 8 Light Rail Vehicle
chosen
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.
-
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 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.
-
D.
MBTA Red Line 1800 series cars
The MBTA Red Line 1800 series cars are a fleet of heavy-rail subway vehicles used on Boston’s Red Line, featuring stainless-steel bodies and modernized interiors compared to earlier generations of MBTA rolling stock.
-
E.
MBTA Red Line 1500/1600 series cars
The MBTA Red Line 1500/1600 series cars are an older generation of heavy-rail subway vehicles that have long served Boston’s Red Line, particularly known for their stainless-steel bodies and traditional rapid-transit design.
- 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_69c6888c820881909fc68f689fe1c251 |
completed | March 27, 2026, 1:39 p.m. |
| NER | Named-entity recognition | batch_69c6ebaef4a081908fadc6d5e2621e80 |
completed | March 27, 2026, 8:42 p.m. |
| NED1 | Entity disambiguation (via context triple) | batch_69c7eee71f5c8190aaff605eeff07390 |
completed | March 28, 2026, 3:08 p.m. |
Created at: March 27, 2026, 3:01 p.m.