Triple

T1648972
Position Surface form Disambiguated ID Type / Status
Subject MBTA Type 9 Light Rail Vehicle E35647 entity
Predicate predecessor P97 FINISHED
Object MBTA Type 7 Light Rail Vehicle E34910 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 7 Light Rail Vehicle | Statement: [MBTA Type 9 Light Rail Vehicle, predecessor, MBTA Type 7 Light Rail Vehicle]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: MBTA Type 7 Light Rail Vehicle
Context triple: [MBTA Type 9 Light Rail Vehicle, predecessor, MBTA Type 7 Light Rail Vehicle]
  • A. MBTA Type 7 Light Rail Vehicle chosen
    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.
  • B. 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.
  • 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 Commuter Rail coaches
    MBTA Commuter Rail coaches are bi-level and single-level passenger railcars used by the Massachusetts Bay Transportation Authority to provide regional rail service across Greater Boston and surrounding areas.
  • E. WMATA 7000-series railcar
    The WMATA 7000-series railcar is a modern, stainless-steel rapid transit car used by the Washington Metro system, featuring improved safety, digital displays, and updated interiors compared to older fleets.
  • 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_69a8860568888190a32cd9f70acbba42 completed March 4, 2026, 7:20 p.m.
NER Named-entity recognition batch_69a90a6537e0819082b966023e0c0583 completed March 5, 2026, 4:45 a.m.
NED1 Entity disambiguation (via context triple) batch_69ad60a73a288190a659e2a1f09ba524 completed March 8, 2026, 11:42 a.m.
Created at: March 4, 2026, 7:29 p.m.