Triple

T2090262
Position Surface form Disambiguated ID Type / Status
Subject Washington Metro Red Line E32650 entity
Predicate safetyIncident P259 FINISHED
Object 2009 Fort Totten crash
The 2009 Fort Totten crash was a deadly rear-end collision between two Washington Metro trains on the Red Line in Washington, D.C., that became the system’s worst accident and prompted major safety reforms.
E231160 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: 2009 Fort Totten crash | Statement: [Washington Metro Red Line, safetyIncident, 2009 Fort Totten crash]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07
Target entity: 2009 Fort Totten crash
Context triple: [Washington Metro Red Line, safetyIncident, 2009 Fort Totten crash]
  • A. 2020 Calabasas helicopter crash
    The 2020 Calabasas helicopter crash was a fatal accident in Southern California that killed basketball legend Kobe Bryant, his daughter Gianna, and seven others, prompting widespread global mourning and scrutiny of helicopter safety practices.
  • B. US Airways Flight 1549
    US Airways Flight 1549 was the 2009 passenger flight that famously ditched in the Hudson River after a bird strike disabled both engines, with all 155 people on board surviving.
  • C. American Airlines Flight 77
    American Airlines Flight 77 was the hijacked domestic passenger flight that was crashed into the Pentagon during the September 11, 2001 terrorist attacks.
  • D. United Airlines Flight 93
    United Airlines Flight 93 was a hijacked passenger flight during the September 11, 2001 terrorist attacks that crashed in Pennsylvania after passengers attempted to overpower the hijackers.
  • E. Alaska Airlines Flight 261
    Alaska Airlines Flight 261 was a scheduled passenger flight that tragically crashed into the Pacific Ocean in 2000 after a catastrophic mechanical failure, killing all 88 people on board and prompting major safety investigations and reforms.
  • 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 Fort Totten crash
Triple: [Washington Metro Red Line, safetyIncident, 2009 Fort Totten crash]
Generated description
The 2009 Fort Totten crash was a deadly rear-end collision between two Washington Metro trains on the Red Line in Washington, D.C., that became the system’s worst accident and prompted major safety reforms.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07
Target entity: 2009 Fort Totten crash
Target entity description: The 2009 Fort Totten crash was a deadly rear-end collision between two Washington Metro trains on the Red Line in Washington, D.C., that became the system’s worst accident and prompted major safety reforms.
  • A. 2020 Calabasas helicopter crash
    The 2020 Calabasas helicopter crash was a fatal accident in Southern California that killed basketball legend Kobe Bryant, his daughter Gianna, and seven others, prompting widespread global mourning and scrutiny of helicopter safety practices.
  • B. US Airways Flight 1549
    US Airways Flight 1549 was the 2009 passenger flight that famously ditched in the Hudson River after a bird strike disabled both engines, with all 155 people on board surviving.
  • C. American Airlines Flight 77
    American Airlines Flight 77 was the hijacked domestic passenger flight that was crashed into the Pentagon during the September 11, 2001 terrorist attacks.
  • D. United Airlines Flight 93
    United Airlines Flight 93 was a hijacked passenger flight during the September 11, 2001 terrorist attacks that crashed in Pennsylvania after passengers attempted to overpower the hijackers.
  • E. Alaska Airlines Flight 261
    Alaska Airlines Flight 261 was a scheduled passenger flight that tragically crashed into the Pacific Ocean in 2000 after a catastrophic mechanical failure, killing all 88 people on board and prompting major safety investigations and reforms.
  • 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_69a885eba0708190999696a45cbec816 completed March 4, 2026, 7:20 p.m.
NER Named-entity recognition batch_69abba7443448190a2642769d0b5fb93 completed March 7, 2026, 5:41 a.m.
NED1 Entity disambiguation (via context triple) batch_69ae2744d8108190b551a970956914c4 completed March 9, 2026, 1:49 a.m.
NEDg Description generation batch_69ae27c0cc40819093dcbcb34e12ada2 completed March 9, 2026, 1:52 a.m.
NED2 Entity disambiguation (via description) batch_69ae2819ec2481908652e9165d1a6636 completed March 9, 2026, 1:53 a.m.
Created at: March 4, 2026, 7:43 p.m.