Triple

T5749565
Position Surface form Disambiguated ID Type / Status
Subject Valley Road station E126815 entity
Predicate serves P98 FINISHED
Object Mattapan trolley line E140142 NE FINISHED

Named-entity recognition

Before disambiguation, gpt-5-mini classified whether the object phrase is a named entity — the step behind the object's NE type shown above.

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: Mattapan trolley line | Statement: [Valley Road station, serves, Mattapan trolley line]

Disambiguation candidates (1 decision)

The exact options the model was shown at each disambiguation step, with the option it chose highlighted — the evidence behind this triple's disambiguated ids.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: Mattapan trolley line
Context triple: [Valley Road station, serves, Mattapan trolley line]
  • A. Mattapan Trolley
    The Mattapan Trolley is a historic light rail line in Boston that operates vintage PCC streetcars between Ashmont and Mattapan stations.
  • B. Mattapan Line chosen
    The Mattapan Line is a light rail trolley service in Boston, Massachusetts, operating as part of the MBTA's Red Line system between Ashmont and Mattapan.
  • C. Lowell Line
    The Lowell Line is a Massachusetts Bay Transportation Authority commuter rail route that runs between Boston’s North Station and the city of Lowell, serving communities in the Merrimack Valley.
  • D. MBTA Fairmount Line
    The MBTA Fairmount Line is a commuter rail service in Boston, Massachusetts, connecting several neighborhoods in the city’s southern corridor to downtown.
  • E. MBTA Green Line B branch
    The MBTA Green Line B branch is a light rail service in Boston that runs along Commonwealth Avenue, primarily serving Boston University and the Allston–Brighton neighborhoods.
  • F. None of above.
  • G. Unsure - the case is ambiguous/there is not enough information to decide.

Provenance (3 batches)

Stage Batch ID Job type Status
creating batch_69c00832aedc81909899801b141fa3b4 elicitation completed
NER batch_69c0288870fc819080e883c9d589359b ner completed
NED1 batch_69c07e358d908190a37e5df89df3aedc ned_source_triple completed
Created at: March 22, 2026, 3:48 p.m.