Triple

T4178932
Position Surface form Disambiguated ID Type / Status
Subject MBTA diesel locomotives E86545 entity
Predicate maintainedAt P32276 FINISHED
Object Readville yard
Readville Yard is a major Massachusetts Bay Transportation Authority (MBTA) rail facility in Boston used primarily for the storage, servicing, and maintenance of commuter rail equipment.
 E419689 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: Readville yard | Statement: [MBTA diesel locomotives, maintainedAt, Readville yard]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: Readville yard
Context triple: [MBTA diesel locomotives, maintainedAt, Readville yard]
  • A. Mattapan yard
    Mattapan Yard is the maintenance and storage facility serving the MBTA’s Mattapan High-Speed Line in Boston, Massachusetts.
  • B. Fallowfield
    Fallowfield is a predominantly student-oriented residential suburb in south Manchester, England, known for its busy social scene and proximity to the city’s universities.
  • C. Savin Hill
    Savin Hill is a neighborhood in Dorchester, Boston, known for its residential character, historic homes, and proximity to a namesake MBTA rapid transit station.
  • D. Watertown Yard
    Watertown Yard is a Massachusetts Bay Transportation Authority bus facility and former streetcar yard in Watertown, Massachusetts, serving as a key layover and terminal point for several bus routes.
  • E. Wilson Yard
    Wilson Yard is a major Toronto Transit Commission subway maintenance and storage facility serving the city's rapid transit network.
  • 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: Readville yard
Triple: [MBTA diesel locomotives, maintainedAt, Readville yard]
Generated description
Readville Yard is a major Massachusetts Bay Transportation Authority (MBTA) rail facility in Boston used primarily for the storage, servicing, and maintenance of commuter rail equipment.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07 
Target entity: Readville yard
Target entity description: Readville Yard is a major Massachusetts Bay Transportation Authority (MBTA) rail facility in Boston used primarily for the storage, servicing, and maintenance of commuter rail equipment.
  • A. Mattapan yard
    Mattapan Yard is the maintenance and storage facility serving the MBTA’s Mattapan High-Speed Line in Boston, Massachusetts.
  • B. Fallowfield
    Fallowfield is a predominantly student-oriented residential suburb in south Manchester, England, known for its busy social scene and proximity to the city’s universities.
  • C. Savin Hill
    Savin Hill is a neighborhood in Dorchester, Boston, known for its residential character, historic homes, and proximity to a namesake MBTA rapid transit station.
  • D. Watertown Yard
    Watertown Yard is a Massachusetts Bay Transportation Authority bus facility and former streetcar yard in Watertown, Massachusetts, serving as a key layover and terminal point for several bus routes.
  • E. Wilson Yard
    Wilson Yard is a major Toronto Transit Commission subway maintenance and storage facility serving the city's rapid transit network.
  • 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_69aed93de98c8190ad838ce507b77c8a completed March 9, 2026, 2:29 p.m.
NER Named-entity recognition batch_69af030114c88190b725908a32ace750 completed March 9, 2026, 5:27 p.m.
NED1 Entity disambiguation (via context triple) batch_69b589f5864881909c9fc787dd9b2341 completed March 14, 2026, 4:16 p.m.
NEDg Description generation batch_69b58a81af5481908ad8fe2c7925cb99 completed March 14, 2026, 4:19 p.m.
NED2 Entity disambiguation (via description) batch_69b58b6ee40c8190a3e93f03a66df1b2 completed March 14, 2026, 4:23 p.m.
Created at: March 9, 2026, 3:45 p.m.