Triple
T1192811
| Position | Surface form | Disambiguated ID | Type / Status |
|---|---|---|---|
| Subject | MBTA Silver Line |
E25599
|
entity |
| Predicate | usesTunnel |
P18707
|
FINISHED |
| Object |
South Boston Transitway
The South Boston Transitway is an underground bus rapid transit tunnel in Boston that carries MBTA Silver Line routes between South Station and the Seaport District.
|
E157161
|
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: South Boston Transitway | Statement: [MBTA Silver Line, usesTunnel, South Boston Transitway]
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: South Boston Transitway Context triple: [MBTA Silver Line, usesTunnel, South Boston Transitway]
-
A.
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.
-
B.
Rose Kennedy Greenway
The Rose Kennedy Greenway is a contemporary linear park in downtown Boston featuring gardens, public art, and community events along the former elevated highway corridor.
-
C.
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.
-
D.
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.
-
E.
MBTA Blue Line
The MBTA Blue Line is a rapid transit line in the Boston metropolitan area that runs primarily along the city’s northeastern corridor, connecting downtown Boston with East Boston, Logan Airport, and Revere.
- 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: South Boston Transitway Triple: [MBTA Silver Line, usesTunnel, South Boston Transitway]
Generated description
The South Boston Transitway is an underground bus rapid transit tunnel in Boston that carries MBTA Silver Line routes between South Station and the Seaport District.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: South Boston Transitway Target entity description: The South Boston Transitway is an underground bus rapid transit tunnel in Boston that carries MBTA Silver Line routes between South Station and the Seaport District.
-
A.
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.
-
B.
Rose Kennedy Greenway
The Rose Kennedy Greenway is a contemporary linear park in downtown Boston featuring gardens, public art, and community events along the former elevated highway corridor.
-
C.
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.
-
D.
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.
-
E.
MBTA Blue Line
The MBTA Blue Line is a rapid transit line in the Boston metropolitan area that runs primarily along the city’s northeastern corridor, connecting downtown Boston with East Boston, Logan Airport, and Revere.
- 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_69a49429f5ec8190a6a205eb0ae81e5e |
completed | March 1, 2026, 7:31 p.m. |
| NER | Named-entity recognition | batch_69a4bd761ef08190b431b80f326d1ab2 |
completed | March 1, 2026, 10:28 p.m. |
| NED1 | Entity disambiguation (via context triple) | batch_69acd46eefa48190baebc12fdf916941 |
completed | March 8, 2026, 1:44 a.m. |
| NEDg | Description generation | batch_69acd517cfec8190ba294bb890d0b4b1 |
completed | March 8, 2026, 1:47 a.m. |
| NED2 | Entity disambiguation (via description) | batch_69acd58946588190a5e92c62b585cdfc |
completed | March 8, 2026, 1:48 a.m. |
Created at: March 1, 2026, 7:45 p.m.