Triple

T639115
Position Surface form Disambiguated ID Type / Status
Subject Mattapan Trolley E16691 entity
Predicate station P726 FINISHED
Object Milton station
Milton station is a light rail stop on the MBTA's Mattapan Trolley line in Milton, Massachusetts, serving local commuters on the Red Line's historic trolley branch.
 E94471 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: Milton station | Statement: [Mattapan Trolley, station, Milton station]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: Milton station
Context triple: [Mattapan Trolley, station, Milton station]
  • A. Lechmere station
    Lechmere station is a Massachusetts Bay Transportation Authority (MBTA) Green Line light rail station serving the East Cambridge neighborhood of Cambridge, Massachusetts.
  • B. Porter station
    Porter station is a major MBTA transit hub in Cambridge, Massachusetts, serving both Red Line subway and commuter rail trains beneath Porter Square.
  • C. Butler station
    Butler station is a small MBTA light rail stop on Boston’s historic Mattapan trolley line in the Dorchester/Mattapan area.
  • D. Lawrence station
    Lawrence station is a Toronto Transit Commission subway station on Line 1 Yonge–University, serving the Lawrence Avenue and Yonge Street area in midtown Toronto.
  • E. Braintree station
    Braintree station is a Massachusetts Bay Transportation Authority (MBTA) rapid transit and commuter rail station in Braintree, Massachusetts, serving as a major park-and-ride hub on Boston’s South Shore.
  • 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: Milton station
Triple: [Mattapan Trolley, station, Milton station]
Generated description
Milton station is a light rail stop on the MBTA's Mattapan Trolley line in Milton, Massachusetts, serving local commuters on the Red Line's historic trolley branch.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07 
Target entity: Milton station
Target entity description: Milton station is a light rail stop on the MBTA's Mattapan Trolley line in Milton, Massachusetts, serving local commuters on the Red Line's historic trolley branch.
  • A. Lechmere station
    Lechmere station is a Massachusetts Bay Transportation Authority (MBTA) Green Line light rail station serving the East Cambridge neighborhood of Cambridge, Massachusetts.
  • B. Porter station
    Porter station is a major MBTA transit hub in Cambridge, Massachusetts, serving both Red Line subway and commuter rail trains beneath Porter Square.
  • C. Butler station
    Butler station is a small MBTA light rail stop on Boston’s historic Mattapan trolley line in the Dorchester/Mattapan area.
  • D. Lawrence station
    Lawrence station is a Toronto Transit Commission subway station on Line 1 Yonge–University, serving the Lawrence Avenue and Yonge Street area in midtown Toronto.
  • E. Braintree station
    Braintree station is a Massachusetts Bay Transportation Authority (MBTA) rapid transit and commuter rail station in Braintree, Massachusetts, serving as a major park-and-ride hub on Boston’s South Shore.
  • 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_69a4936be1c88190af56540324b57da7 completed March 1, 2026, 7:28 p.m.
NER Named-entity recognition batch_69a49f00260081909d1a679182e23d10 completed March 1, 2026, 8:18 p.m.
NED1 Entity disambiguation (via context triple) batch_69a67eeff434819090fb550b6bf07d86 completed March 3, 2026, 6:25 a.m.
NEDg Description generation batch_69a67f6615188190ad526ba0875209a9 completed March 3, 2026, 6:27 a.m.
NED2 Entity disambiguation (via description) batch_69a6808069e08190bc6df238c91d24c4 completed March 3, 2026, 6:32 a.m.
Created at: March 1, 2026, 7:35 p.m.