Triple

T5958337
Position Surface form Disambiguated ID Type / Status
Subject WMATA 6000-series railcar E132571 entity
Predicate usedOnLine P15252 FINISHED
Object Red Line
The Red Line is a major Washington Metro rapid transit route in the Washington, D.C. metropolitan area, running through key downtown and suburban corridors.
 E26147 NE FINISHED

Named-entity recognition

Before disambiguation, gpt-5-mini classified whether the object phrase is a named entity — the step behind the object's NE type shown above.

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: Red Line | Statement: [WMATA 6000-series railcar, usedOnLine, Red Line]

Disambiguation candidates (2 decisions)

The exact options the model was shown at each disambiguation step, with the option it chose highlighted — the evidence behind this triple's disambiguated ids.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: Red Line
Context triple: [WMATA 6000-series railcar, usedOnLine, Red Line]
  • A. Red Line
    The Red Line is one of the primary heavy-rail rapid transit routes in Atlanta’s MARTA system, running north–south and serving key destinations across the metropolitan area.
  • B. Red Line
    Red Line was the original name of Los Angeles Metro’s B Line, a heavy-rail subway corridor serving key neighborhoods between Downtown Los Angeles and North Hollywood.
  • C. Red Line
    Red Line is one of the main rapid transit routes of the Dubai Metro, running along key areas of the city and serving many of its major commercial and residential districts.
  • D. Red Line
    The Red Line is one of the major corridors of the Delhi Metro rapid transit system, serving numerous densely populated areas in and around Delhi.
  • E. Red Line
    The Red Line is a primary route of the MetroLink light rail system serving key destinations in the St. Louis metropolitan area.
  • F. None of above. chosen
  • G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07 
Target entity: Red Line
Target entity description: The Red Line is a major Washington Metro rapid transit route in the Washington, D.C. metropolitan area, running through key downtown and suburban corridors.
  • A. Red Line chosen
    Red Line is a major rapid transit route in the Washington Metro system, running through key areas of Washington, D.C., and its Maryland suburbs.
  • B. Red Line
    The Red Line is a major rapid transit route in the Boston metropolitan area, operated by the MBTA and running primarily north–south through key neighborhoods and suburbs.
  • C. Red Line
    The Red Line is a major rapid transit route in Chicago that runs north–south through the city, serving as one of the busiest lines in its subway and elevated rail system.
  • D. Red Line
    The Red Line is a major light rail route in the Dallas Area Rapid Transit (DART) system serving key corridors across the Dallas–Fort Worth metro area.
  • E. Red Line
    The Red Line is a major rapid transit route serving Columbia, providing key north–south connections across the city.
  • F. None of above.

How the object was described

The object's one-sentence description was generated by prompting gpt-5.1 with the object name and this triple as context.

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: Red Line
Triple: [WMATA 6000-series railcar, usedOnLine, Red Line]
Generated description
The Red Line is a major Washington Metro rapid transit route in the Washington, D.C. metropolitan area, running through key downtown and suburban corridors.

Provenance (5 batches)

Stage Batch ID Job type Status
creating batch_69c0086b05cc8190a8f36a96927a525c elicitation completed
NER batch_69c039c48d0c81908e794c52fddf2ca2 ner completed
NED1 batch_69c0e3e3736c8190b445156f0c1bdf1f ned_source_triple completed
NED2 batch_69c0ed1871a88190a2894e7e156478d7 ned_description completed
NEDg batch_69c0ec751abc8190a1f6d09e8c47cd59 nedg completed
Created at: March 22, 2026, 4:02 p.m.