Triple

T11368979

Position	Surface form	Disambiguated ID	Type / Status
Subject	MBTA Orange Line Back Bay branch	`E269290`	entity
Predicate	connectsWith	`P37`	FINISHED
Object	Amtrak at Back Bay station Amtrak at Back Bay station refers to the intercity passenger rail services, including routes like the Northeast Regional and Acela, that stop at Boston’s centrally located Back Bay transportation hub.	`E921754`	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: Amtrak at Back Bay station | Statement: [MBTA Orange Line Back Bay branch, connectsWith, Amtrak at Back Bay station]

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

Target entity: Amtrak at Back Bay station
Context triple: [MBTA Orange Line Back Bay branch, connectsWith, Amtrak at Back Bay station]

A. Amtrak at South Station
Amtrak at South Station is the intercity passenger rail service operating from Boston’s historic South Station, providing regional and long-distance train connections along the Northeast Corridor and beyond.
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 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.
D. 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.
E. 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.
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: Amtrak at Back Bay station
Triple: [MBTA Orange Line Back Bay branch, connectsWith, Amtrak at Back Bay station]

Generated description

Amtrak at Back Bay station refers to the intercity passenger rail services, including routes like the Northeast Regional and Acela, that stop at Boston’s centrally located Back Bay transportation hub.

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

Target entity: Amtrak at Back Bay station
Target entity description: Amtrak at Back Bay station refers to the intercity passenger rail services, including routes like the Northeast Regional and Acela, that stop at Boston’s centrally located Back Bay transportation hub.

A. Amtrak at South Station
Amtrak at South Station is the intercity passenger rail service operating from Boston’s historic South Station, providing regional and long-distance train connections along the Northeast Corridor and beyond.
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 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.
D. 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.
E. 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.
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_69d6aacca1048190b39dbbc2174616fa`	completed	April 8, 2026, 7:21 p.m.
NER	Named-entity recognition	`batch_69d7ea89e1148190b0ca29db9d7e2cbd`	completed	April 9, 2026, 6:06 p.m.
NED1	Entity disambiguation (via context triple)	`batch_69e5567b67f88190b0412e30b346d36d`	completed	April 19, 2026, 10:26 p.m.
NEDg	Description generation	`batch_69e562c6e7c8819098d22a6e0daa4a51`	completed	April 19, 2026, 11:18 p.m.
NED2	Entity disambiguation (via description)	`batch_69e56a472f0c819086c1cccaa5ca0ae7`	completed	April 19, 2026, 11:50 p.m.

Created at: April 8, 2026, 9:33 p.m.