Triple

T21367112
Position Surface form Disambiguated ID Type / Status
Subject MBTA Mattapan Line E526945 entity
Predicate connectsTo P845 FINISHED
Object Red Line at Ashmont station
The Red Line at Ashmont station is a major Boston rapid transit terminus where passengers transfer between the Red Line subway and the Mattapan trolley line.
 E1479930 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: Red Line at Ashmont station | Statement: [MBTA Mattapan Line, connectsTo, Red Line at Ashmont station]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: Red Line at Ashmont station
Context triple: [MBTA Mattapan Line, connectsTo, Red Line at Ashmont station]
  • A. Orange Line at North Station
    Orange Line at North Station is a major Boston subway stop on the MBTA Orange Line that serves as a key transfer point between rapid transit and several commuter rail lines, including the Newburyport/Rockport Line.
  • B. Green Line at North Station
    The Green Line at North Station is a major MBTA light rail stop in Boston that serves as a key transfer point between the Green Line trolleys and regional commuter rail services.
  • C. MBTA Red Line at Alewife Station
    The MBTA Red Line at Alewife Station is a major rapid transit terminus in North Cambridge that connects surrounding neighborhoods like Cambridge Highlands to downtown Boston and the broader subway network.
  • D. MBTA Red Line at South Station
    The MBTA Red Line at South Station is a major rapid transit stop in downtown Boston that serves as a key hub for subway, commuter rail, intercity rail, and bus connections.
  • E. MBTA Silver Line at South Station
    The MBTA Silver Line at South Station is a key Boston bus rapid transit hub providing underground and surface connections between South Station and destinations including the Seaport District and Logan Airport.
  • 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: Red Line at Ashmont station
Triple: [MBTA Mattapan Line, connectsTo, Red Line at Ashmont station]
Generated description
The Red Line at Ashmont station is a major Boston rapid transit terminus where passengers transfer between the Red Line subway and the Mattapan trolley line.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07 
Target entity: Red Line at Ashmont station
Target entity description: The Red Line at Ashmont station is a major Boston rapid transit terminus where passengers transfer between the Red Line subway and the Mattapan trolley line.
  • A. Orange Line at North Station
    Orange Line at North Station is a major Boston subway stop on the MBTA Orange Line that serves as a key transfer point between rapid transit and several commuter rail lines, including the Newburyport/Rockport Line.
  • B. Green Line at North Station
    The Green Line at North Station is a major MBTA light rail stop in Boston that serves as a key transfer point between the Green Line trolleys and regional commuter rail services.
  • C. MBTA Red Line at Alewife Station
    The MBTA Red Line at Alewife Station is a major rapid transit terminus in North Cambridge that connects surrounding neighborhoods like Cambridge Highlands to downtown Boston and the broader subway network.
  • D. MBTA Red Line at South Station
    The MBTA Red Line at South Station is a major rapid transit stop in downtown Boston that serves as a key hub for subway, commuter rail, intercity rail, and bus connections.
  • E. MBTA Silver Line at South Station
    The MBTA Silver Line at South Station is a key Boston bus rapid transit hub providing underground and surface connections between South Station and destinations including the Seaport District and Logan Airport.
  • 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_69e0b51e80808190ba5cb05667af02a9 completed April 16, 2026, 10:08 a.m.
NER Named-entity recognition batch_69ee5bae5eb88190be6d9ff4dc03d52b completed April 26, 2026, 6:38 p.m.
NED1 Entity disambiguation (via context triple) batch_6a09ad6e67c88190b8152ce0bcd77f1c completed May 17, 2026, 11:58 a.m.
NEDg Description generation batch_6a09ae6c7ce481908021fecbc181bb93 completed May 17, 2026, 12:02 p.m.
NED2 Entity disambiguation (via description) batch_6a09aedbc2dc8190914e279d6425fa50 completed May 17, 2026, 12:04 p.m.
Created at: April 16, 2026, 5:09 p.m.