Triple

T19658018
Position Surface form Disambiguated ID Type / Status
Subject MBTA Lowell Line E471999 entity
Predicate railSystem P522 FINISHED
Object North Side MBTA Commuter Rail — NE NERFINISHED

How this triple was built (3 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: North Side MBTA Commuter Rail | Statement: [MBTA Lowell Line, railSystem, North Side MBTA Commuter Rail]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: North Side MBTA Commuter Rail
Context triple: [MBTA Lowell Line, railSystem, North Side MBTA Commuter Rail]
  • A. MBTA Commuter Rail Greenbush Line
    The MBTA Commuter Rail Greenbush Line is a Massachusetts Bay Transportation Authority commuter rail route connecting Boston’s South Station with coastal South Shore communities, including towns such as Hingham, Cohasset, and Scituate.
  • B. 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.
  • C. MBTA Ashmont Branch
    The MBTA Ashmont Branch is a rapid transit line of Boston’s Red Line that runs from JFK/UMass station through Dorchester to Ashmont, serving several southern neighborhoods of the city.
  • D. MBTA Greenbush Line
    The MBTA Greenbush Line is a commuter rail line in Massachusetts that runs from Boston to the South Shore, serving communities including its namesake area in Scituate.
  • E. MBTA Commuter Rail Zone 6
    MBTA Commuter Rail Zone 6 is a fare zone in the Greater Boston regional rail system used to determine ticket prices for trips between outer suburban stations and central Boston.
  • F. None of above. chosen
  • G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07 
Target entity: North Side MBTA Commuter Rail
Target entity description: North Side MBTA Commuter Rail is the group of Boston-area commuter rail lines operated from North Station that serve northern suburbs and cities such as Lowell, Haverhill, and Newburyport/Rockport.
  • A. MBTA Commuter Rail Greenbush Line
    The MBTA Commuter Rail Greenbush Line is a Massachusetts Bay Transportation Authority commuter rail route connecting Boston’s South Station with coastal South Shore communities, including towns such as Hingham, Cohasset, and Scituate.
  • B. 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.
  • C. MBTA Ashmont Branch
    The MBTA Ashmont Branch is a rapid transit line of Boston’s Red Line that runs from JFK/UMass station through Dorchester to Ashmont, serving several southern neighborhoods of the city.
  • D. MBTA Greenbush Line
    The MBTA Greenbush Line is a commuter rail line in Massachusetts that runs from Boston to the South Shore, serving communities including its namesake area in Scituate.
  • E. MBTA Commuter Rail Zone 6
    MBTA Commuter Rail Zone 6 is a fare zone in the Greater Boston regional rail system used to determine ticket prices for trips between outer suburban stations and central Boston.
  • F. None of above. chosen

Provenance (2 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_69d8e51395348190ac1416d46dfc6db0 completed April 10, 2026, 11:54 a.m.
NER Named-entity recognition batch_69e641475f408190bd42ef3f8d590719 completed April 20, 2026, 3:07 p.m.
Created at: April 10, 2026, 1:45 p.m.