Triple

T10082143

Position	Surface form	Disambiguated ID	Type / Status
Subject	Red Line Alewife branch	`E213926`	entity
Predicate	connectsWith	`P37`	FINISHED
Object	MBTA commuter rail at Porter station The MBTA commuter rail at Porter station is a regional rail stop in Cambridge, Massachusetts, providing connections between local subway service and longer-distance commuter trains on the Fitchburg Line.	`E840552`	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 commuter rail at Porter station | Statement: [Red Line Alewife branch, connectsWith, MBTA commuter rail at Porter station]

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

Target entity: MBTA commuter rail at Porter station
Context triple: [Red Line Alewife branch, connectsWith, MBTA commuter rail at Porter station]

A. MBTA commuter rail at Back Bay
MBTA commuter rail at Back Bay is a major Boston rail station where regional commuter trains connect with subway services, including the Green Line’s E Branch.
B. MBTA Commuter Rail at North Station
MBTA Commuter Rail at North Station is a major Boston rail hub where regional trains connect downtown with numerous suburbs and outlying cities across Massachusetts.
C. MBTA commuter rail at Gallagher Terminal
The MBTA commuter rail at Gallagher Terminal is a regional rail service hub in Lowell, Massachusetts, providing passenger train connections between the city and the greater Boston area.
D. MBTA Commuter Rail at South Station
MBTA Commuter Rail at South Station is the regional rail service hub in downtown Boston that provides commuter train connections between the city and surrounding suburbs and cities across Massachusetts and neighboring states.
E. MBTA commuter rail terminals
MBTA commuter rail terminals are major passenger rail hubs in the Boston area that serve as endpoints and transfer points for regional trains connecting the city with its surrounding suburbs and communities.
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 commuter rail at Porter station
Triple: [Red Line Alewife branch, connectsWith, MBTA commuter rail at Porter station]

Generated description

The MBTA commuter rail at Porter station is a regional rail stop in Cambridge, Massachusetts, providing connections between local subway service and longer-distance commuter trains on the Fitchburg Line.

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

Target entity: MBTA commuter rail at Porter station
Target entity description: The MBTA commuter rail at Porter station is a regional rail stop in Cambridge, Massachusetts, providing connections between local subway service and longer-distance commuter trains on the Fitchburg Line.

A. MBTA commuter rail at Back Bay
MBTA commuter rail at Back Bay is a major Boston rail station where regional commuter trains connect with subway services, including the Green Line’s E Branch.
B. MBTA Commuter Rail at North Station
MBTA Commuter Rail at North Station is a major Boston rail hub where regional trains connect downtown with numerous suburbs and outlying cities across Massachusetts.
C. MBTA commuter rail at Gallagher Terminal
The MBTA commuter rail at Gallagher Terminal is a regional rail service hub in Lowell, Massachusetts, providing passenger train connections between the city and the greater Boston area.
D. MBTA Commuter Rail at South Station
MBTA Commuter Rail at South Station is the regional rail service hub in downtown Boston that provides commuter train connections between the city and surrounding suburbs and cities across Massachusetts and neighboring states.
E. MBTA commuter rail terminals
MBTA commuter rail terminals are major passenger rail hubs in the Boston area that serve as endpoints and transfer points for regional trains connecting the city with its surrounding suburbs and communities.
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_69ca839bf730819086900c323c9b8c95`	completed	March 30, 2026, 2:07 p.m.
NER	Named-entity recognition	`batch_69cdd03482d481908b03d35dc2d16395`	completed	April 2, 2026, 2:11 a.m.
NED1	Entity disambiguation (via context triple)	`batch_69d2b66b256c8190861066f7c19008d2`	completed	April 5, 2026, 7:22 p.m.
NEDg	Description generation	`batch_69d2b78f3c248190b104937e2d669882`	completed	April 5, 2026, 7:27 p.m.
NED2	Entity disambiguation (via description)	`batch_69d2b84a26a481908ab2705d5883cfce`	completed	April 5, 2026, 7:30 p.m.

Created at: March 30, 2026, 9 p.m.