Triple

T9271030
Position Surface form Disambiguated ID Type / Status
Subject Lowell Line E222827 entity
Predicate lineNumber P1864 FINISHED
Object MBTA Line 12 (internal designation)
MBTA Line 12 (internal designation) is the internal system code used by the Massachusetts Bay Transportation Authority to refer to its commuter rail service known publicly as the Lowell Line.
 E789076 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: MBTA Line 12 (internal designation) | Statement: [Lowell Line, lineNumber, MBTA Line 12 (internal designation)]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: MBTA Line 12 (internal designation)
Context triple: [Lowell Line, lineNumber, MBTA Line 12 (internal designation)]
  • A. MBTA Green Line A branch
    The MBTA Green Line A branch was a former light rail line in Boston and its western suburbs that once ran between downtown and Watertown before being replaced by bus service.
  • B. MBTA Green Line main line
    The MBTA Green Line main line is the core light rail trunk of Boston’s Green Line system, running through central Boston and connecting multiple branches that serve surrounding neighborhoods and suburbs.
  • C. MBTA Green Line D branch
    The MBTA Green Line D branch is a light rail line in the Boston metropolitan area that runs between downtown Boston and several western suburbs, including Newton and Riverside.
  • D. 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.
  • E. MBTA Green Line E branch
    The MBTA Green Line E branch is a light rail line in Boston that runs from downtown through the Back Bay and Longwood Medical Area to Heath Street, serving major hospitals, universities, and residential neighborhoods.
  • 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: MBTA Line 12 (internal designation)
Triple: [Lowell Line, lineNumber, MBTA Line 12 (internal designation)]
Generated description
MBTA Line 12 (internal designation) is the internal system code used by the Massachusetts Bay Transportation Authority to refer to its commuter rail service known publicly as the Lowell Line.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07 
Target entity: MBTA Line 12 (internal designation)
Target entity description: MBTA Line 12 (internal designation) is the internal system code used by the Massachusetts Bay Transportation Authority to refer to its commuter rail service known publicly as the Lowell Line.
  • A. MBTA Green Line A branch
    The MBTA Green Line A branch was a former light rail line in Boston and its western suburbs that once ran between downtown and Watertown before being replaced by bus service.
  • B. MBTA Green Line main line
    The MBTA Green Line main line is the core light rail trunk of Boston’s Green Line system, running through central Boston and connecting multiple branches that serve surrounding neighborhoods and suburbs.
  • C. MBTA Green Line D branch
    The MBTA Green Line D branch is a light rail line in the Boston metropolitan area that runs between downtown Boston and several western suburbs, including Newton and Riverside.
  • D. 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.
  • E. MBTA Green Line E branch
    The MBTA Green Line E branch is a light rail line in Boston that runs from downtown through the Back Bay and Longwood Medical Area to Heath Street, serving major hospitals, universities, and residential neighborhoods.
  • 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_69ca841ffe208190aa7bcffbef2f8379 completed March 30, 2026, 2:09 p.m.
NER Named-entity recognition batch_69cd07865790819099b3865a25dae58a completed April 1, 2026, 11:54 a.m.
NED1 Entity disambiguation (via context triple) batch_69d09c2ca500819083ef4aa37f3e3a7f completed April 4, 2026, 5:05 a.m.
NEDg Description generation batch_69d09d5047e8819082dbb2e44547b41c completed April 4, 2026, 5:10 a.m.
NED2 Entity disambiguation (via description) batch_69d09dec544c819095e2109d5e1671d3 completed April 4, 2026, 5:13 a.m.
Created at: March 30, 2026, 7:33 p.m.