Triple

T9557524

Position	Surface form	Disambiguated ID	Type / Status
Subject	Central station	`E230577`	entity
Predicate	isOnCorridor	`P1018`	FINISHED
Object	Red Line trunk between Alewife and Ashmont/Braintree The Red Line trunk between Alewife and Ashmont/Braintree is the central, heavily used core segment of Boston’s MBTA Red Line that carries trains through key downtown and Cambridge stations before the line branches south.	`E806433`	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 trunk between Alewife and Ashmont/Braintree | Statement: [Central station, isOnCorridor, Red Line trunk between Alewife and Ashmont/Braintree]

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Red Line trunk between Alewife and Ashmont/Braintree
Context triple: [Central station, isOnCorridor, Red Line trunk between Alewife and Ashmont/Braintree]

A. Red Line Alewife branch
The Red Line Alewife branch is a segment of Boston's MBTA Red Line rapid transit system that runs through Cambridge and surrounding areas, terminating at Alewife station.
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. Franklin/Foxboro Line
The Franklin/Foxboro Line is a Massachusetts Bay Transportation Authority commuter rail route serving Boston and its southwestern suburbs, including Franklin and Foxborough.
D. Middleborough/Lakeville Line
The Middleborough/Lakeville Line is a Massachusetts Bay Transportation Authority commuter rail route serving Boston and southeastern Massachusetts communities including Middleborough and Lakeville.
E. Ashmont–Braintree branch of the Red Line
The Ashmont–Braintree branch of the Red Line is a major rapid transit corridor of Boston’s MBTA system, running south from downtown Boston to the suburbs of Ashmont and Braintree.
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 trunk between Alewife and Ashmont/Braintree
Triple: [Central station, isOnCorridor, Red Line trunk between Alewife and Ashmont/Braintree]

Generated description

The Red Line trunk between Alewife and Ashmont/Braintree is the central, heavily used core segment of Boston’s MBTA Red Line that carries trains through key downtown and Cambridge stations before the line branches south.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Red Line trunk between Alewife and Ashmont/Braintree
Target entity description: The Red Line trunk between Alewife and Ashmont/Braintree is the central, heavily used core segment of Boston’s MBTA Red Line that carries trains through key downtown and Cambridge stations before the line branches south.

A. Red Line Alewife branch
The Red Line Alewife branch is a segment of Boston's MBTA Red Line rapid transit system that runs through Cambridge and surrounding areas, terminating at Alewife station.
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. Franklin/Foxboro Line
The Franklin/Foxboro Line is a Massachusetts Bay Transportation Authority commuter rail route serving Boston and its southwestern suburbs, including Franklin and Foxborough.
D. Middleborough/Lakeville Line
The Middleborough/Lakeville Line is a Massachusetts Bay Transportation Authority commuter rail route serving Boston and southeastern Massachusetts communities including Middleborough and Lakeville.
E. Ashmont–Braintree branch of the Red Line
The Ashmont–Braintree branch of the Red Line is a major rapid transit corridor of Boston’s MBTA system, running south from downtown Boston to the suburbs of Ashmont and Braintree.
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_69ca847e53a88190a60eed7e02257f10`	completed	March 30, 2026, 2:11 p.m.
NER	Named-entity recognition	`batch_69cd99487b4c819086e02e29e37b593f`	completed	April 1, 2026, 10:16 p.m.
NED1	Entity disambiguation (via context triple)	`batch_69d15296303c8190adda4b24036d9390`	completed	April 4, 2026, 6:04 p.m.
NEDg	Description generation	`batch_69d1539bad8481909f9bd060aa3b651c`	completed	April 4, 2026, 6:08 p.m.
NED2	Entity disambiguation (via description)	`batch_69d154567f408190a848eea4ca905fb6`	completed	April 4, 2026, 6:11 p.m.

Created at: March 30, 2026, 8:03 p.m.