Triple
T68905
| Position | Surface form | Disambiguated ID | Type / Status |
|---|---|---|---|
| Subject | Washington Metro |
E1376
|
entity |
| Predicate | safetyIncident |
P259
|
FINISHED |
| Object |
2009 Red Line collision
The 2009 Red Line collision was a deadly rear-end crash between two Washington Metro trains near Fort Totten station that became one of the worst accidents in the system’s history and prompted major safety reforms.
|
E4791
|
NE FINISHED |
How this triple was built (5 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: 2009 Red Line collision | Statement: [Washington Metro, safetyIncident, 2009 Red Line collision]
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: 2009 Red Line collision Context triple: [Washington Metro, safetyIncident, 2009 Red Line collision]
-
A.
Chappaquiddick incident
The Chappaquiddick incident was a 1969 car accident on Chappaquiddick Island involving Senator Edward M. Kennedy that resulted in the death of Mary Jo Kopechne and had lasting political repercussions for Kennedy's career.
-
B.
MARC Train
MARC Train is a commuter rail service operating in Maryland and the surrounding region, connecting cities such as Washington, D.C., Baltimore, and Martinsburg.
-
C.
MAX Red Line
MAX Red Line is a light rail service in the Portland, Oregon metropolitan area that connects downtown Portland with Portland International Airport and the city’s western suburbs.
-
D.
Haymarket affair
The Haymarket affair was an 1886 labor protest and bombing in Chicago that became a pivotal moment in the history of workers’ rights and the labor movement in the United States.
-
E.
Altmark Incident
The Altmark Incident was a 1940 World War II naval confrontation in Norwegian waters, where British forces boarded the German tanker Altmark to free imprisoned Allied sailors, heightening tensions during the early "Phoney War" period.
- 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: 2009 Red Line collision Triple: [Washington Metro, safetyIncident, 2009 Red Line collision]
Generated description
The 2009 Red Line collision was a deadly rear-end crash between two Washington Metro trains near Fort Totten station that became one of the worst accidents in the system’s history and prompted major safety reforms.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: 2009 Red Line collision Target entity description: The 2009 Red Line collision was a deadly rear-end crash between two Washington Metro trains near Fort Totten station that became one of the worst accidents in the system’s history and prompted major safety reforms.
-
A.
Chappaquiddick incident
The Chappaquiddick incident was a 1969 car accident on Chappaquiddick Island involving Senator Edward M. Kennedy that resulted in the death of Mary Jo Kopechne and had lasting political repercussions for Kennedy's career.
-
B.
MARC Train
MARC Train is a commuter rail service operating in Maryland and the surrounding region, connecting cities such as Washington, D.C., Baltimore, and Martinsburg.
-
C.
MAX Red Line
MAX Red Line is a light rail service in the Portland, Oregon metropolitan area that connects downtown Portland with Portland International Airport and the city’s western suburbs.
-
D.
Haymarket affair
The Haymarket affair was an 1886 labor protest and bombing in Chicago that became a pivotal moment in the history of workers’ rights and the labor movement in the United States.
-
E.
Altmark Incident
The Altmark Incident was a 1940 World War II naval confrontation in Norwegian waters, where British forces boarded the German tanker Altmark to free imprisoned Allied sailors, heightening tensions during the early "Phoney War" period.
- F. None of above. chosen
PD
Predicate disambiguation
gpt-5-mini-2025-08-07
Target predicate: safetyIncident Context triple: [Washington Metro, safetyIncident, 2009 Red Line collision]
-
A.
accidentType
Indicates the specific category or kind of accident associated with an event or incident.
-
B.
hazardType
Indicates the specific kind or category of hazard associated with an entity or situation.
-
C.
significantEvent
chosen
Indicates that an event involving the entities is of notable importance or impact within a given context.
-
D.
causeOf
Indicates that one entity brings about, produces, or is responsible for the occurrence or existence of another entity or event.
-
E.
shipInvolved
Indicates that a ship participates in, is associated with, or plays a role in a specified event or situation.
- F. None of above.
Provenance (6 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_69a24c06b3bc8190aa4ac89026115efc |
completed | Feb. 28, 2026, 1:59 a.m. |
| NER | Named-entity recognition | batch_69a24fd16c248190a6ee4cd96c388772 |
completed | Feb. 28, 2026, 2:15 a.m. |
| NED1 | Entity disambiguation (via context triple) | batch_69a2554da8848190a445b503d98769aa |
completed | Feb. 28, 2026, 2:39 a.m. |
| NEDg | Description generation | batch_69a255b409a081908871ed7fee07be29 |
completed | Feb. 28, 2026, 2:40 a.m. |
| NED2 | Entity disambiguation (via description) | batch_69a256e8f7ec81909450c07bf7bafa0a |
completed | Feb. 28, 2026, 2:46 a.m. |
| PD | Predicate disambiguation | batch_69a24ea8cfd081908a26edad2473dde3 |
completed | Feb. 28, 2026, 2:10 a.m. |
Created at: Feb. 28, 2026, 2:03 a.m.