Triple

T20301818
Position Surface form Disambiguated ID Type / Status
Subject Red Line (MBTA) E505499 entity
Predicate usesRollingStock P5426 FINISHED
Object MBTA Red Line subway cars NE NERFINISHED

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 Red Line subway cars | Statement: [Red Line (MBTA), usesRollingStock, MBTA Red Line subway cars]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07
Target entity: MBTA Red Line subway cars
Context triple: [Red Line (MBTA), usesRollingStock, MBTA Red Line subway cars]
  • A. MBTA Red Line subway cars chosen
    MBTA Red Line subway cars are the electric rapid transit vehicles that operate on Boston’s Red Line, providing high-capacity urban rail service across key corridors including the Alewife branch.
  • B. MBTA Orange Line subway cars
    MBTA Orange Line subway cars are rapid transit vehicles used on Boston’s Orange Line, known for their high-capacity, heavy-rail design serving key north–south corridors through the city.
  • C. 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.
  • D. MBTA Red Line 1700 series cars
    The MBTA Red Line 1700 series cars are a fleet of heavy-rail subway vehicles used on Boston’s Red Line, particularly associated with service on the Braintree Branch.
  • E. 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.
  • F. None of above.
  • G. Unsure - the case is ambiguous/there is not enough information to decide.

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_69e0b4b8ab648190906e18538c250148 completed April 16, 2026, 10:06 a.m.
NER Named-entity recognition batch_69e6770d82b48190b21ce7c52ec6d5a0 completed April 20, 2026, 6:57 p.m.
Created at: April 16, 2026, 11:17 a.m.