Triple
T16594
| Position | Surface form | Disambiguated ID | Type / Status |
|---|---|---|---|
| Subject | Mystic River |
E329
|
entity |
| Predicate | crossedBy |
P416
|
FINISHED |
| Object |
MBTA Orange Line bridge near Wellington
The MBTA Orange Line bridge near Wellington is a rapid transit rail bridge in Medford, Massachusetts, carrying Orange Line trains across the Mystic River between Wellington and Assembly stations.
|
E16446
|
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 Orange Line bridge near Wellington | Statement: [Mystic River, crossedBy, MBTA Orange Line bridge near Wellington]
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: MBTA Orange Line bridge near Wellington Context triple: [Mystic River, crossedBy, MBTA Orange Line bridge near Wellington]
-
A.
MBTA Red Line
The MBTA Red Line is a major rapid transit line in the Boston metropolitan area that runs through key communities including Cambridge, connecting them to downtown Boston and other parts of the region.
-
B.
MBTA Fitchburg Line
The MBTA Fitchburg Line is a commuter rail route in the Greater Boston area that runs between Boston and Fitchburg, serving numerous suburban communities along the way.
-
C.
Cape Cod Canal Railroad Bridge
The Cape Cod Canal Railroad Bridge is a historic vertical-lift railway bridge in Massachusetts that carries trains across the Cape Cod Canal and is notable for its impressive movable-span engineering.
-
D.
Mystic River Bridge
The Mystic River Bridge, officially known as the Maurice J. Tobin Memorial Bridge, is a major steel cantilever roadway bridge in Boston, Massachusetts, carrying U.S. Route 1 over the Mystic River between Charlestown and Chelsea.
-
E.
14th Street Bridge complex
The 14th Street Bridge complex is a group of highway and railway bridges over the Potomac River that serves as a major transportation link between Northern Virginia and Washington, D.C.
- 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 Orange Line bridge near Wellington Triple: [Mystic River, crossedBy, MBTA Orange Line bridge near Wellington]
Generated description
The MBTA Orange Line bridge near Wellington is a rapid transit rail bridge in Medford, Massachusetts, carrying Orange Line trains across the Mystic River between Wellington and Assembly stations.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: MBTA Orange Line bridge near Wellington Target entity description: The MBTA Orange Line bridge near Wellington is a rapid transit rail bridge in Medford, Massachusetts, carrying Orange Line trains across the Mystic River between Wellington and Assembly stations.
-
A.
MBTA Red Line
The MBTA Red Line is a major rapid transit line in the Boston metropolitan area that runs through key communities including Cambridge, connecting them to downtown Boston and other parts of the region.
-
B.
MBTA Fitchburg Line
The MBTA Fitchburg Line is a commuter rail route in the Greater Boston area that runs between Boston and Fitchburg, serving numerous suburban communities along the way.
-
C.
Cape Cod Canal Railroad Bridge
The Cape Cod Canal Railroad Bridge is a historic vertical-lift railway bridge in Massachusetts that carries trains across the Cape Cod Canal and is notable for its impressive movable-span engineering.
-
D.
Mystic River Bridge
The Mystic River Bridge, officially known as the Maurice J. Tobin Memorial Bridge, is a major steel cantilever roadway bridge in Boston, Massachusetts, carrying U.S. Route 1 over the Mystic River between Charlestown and Chelsea.
-
E.
14th Street Bridge complex
The 14th Street Bridge complex is a group of highway and railway bridges over the Potomac River that serves as a major transportation link between Northern Virginia and Washington, D.C.
- 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_69a23d7ad88c8190bffe8ab091d86642 |
completed | Feb. 28, 2026, 12:57 a.m. |
| NER | Named-entity recognition | batch_69a24003aca48190b98c2df43d65e496 |
completed | Feb. 28, 2026, 1:08 a.m. |
| NED1 | Entity disambiguation (via context triple) | batch_69a2b4b495c4819084ed1b661f1d0a24 |
completed | Feb. 28, 2026, 9:26 a.m. |
| NEDg | Description generation | batch_69a2b5c243e0819087bb4342c5a65eec |
completed | Feb. 28, 2026, 9:30 a.m. |
| NED2 | Entity disambiguation (via description) | batch_69a2b6498fcc819089fcc02806e8f975 |
completed | Feb. 28, 2026, 9:32 a.m. |
Created at: Feb. 28, 2026, 1:02 a.m.