Triple

T12059984
Position Surface form Disambiguated ID Type / Status
Subject Baltimore rail network E287140 entity
Predicate hasStructure P35 FINISHED
Object Union Tunnel (Baltimore)
Union Tunnel in Baltimore is a historic railroad tunnel that carries passenger and freight trains beneath the city as part of the Northeast Corridor.
 E973029 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: Union Tunnel (Baltimore) | Statement: [Baltimore rail network, hasStructure, Union Tunnel (Baltimore)]

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: Union Tunnel (Baltimore)
Context triple: [Baltimore rail network, hasStructure, Union Tunnel (Baltimore)]
  • A. Baltimore and Potomac Tunnel
    The Baltimore and Potomac Tunnel is a 19th-century railroad tunnel in Baltimore, Maryland, that serves as a critical but aging bottleneck on the Northeast Corridor rail line.
  • B. Fort McHenry Tunnel
    The Fort McHenry Tunnel is a major underwater highway tunnel in Baltimore, Maryland, carrying Interstate 95 beneath the harbor near Fort McHenry to ease traffic through the city.
  • C. Baltimore Harbor Tunnel
    The Baltimore Harbor Tunnel is a vehicular tunnel in Baltimore, Maryland, that carries Interstate 895 beneath the harbor as a major route for traffic bypassing downtown.
  • D. Howard Street Tunnel
    The Howard Street Tunnel is a historic railroad tunnel in Baltimore, Maryland, that carries freight trains beneath the city’s downtown.
  • E. Potomac River tunnel
    The Potomac River tunnel is an underwater rail tunnel in the Washington, D.C. area that carries Washington Metro trains beneath the Potomac River.
  • 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: Union Tunnel (Baltimore)
Target entity description: Union Tunnel in Baltimore is a historic railroad tunnel that carries passenger and freight trains beneath the city as part of the Northeast Corridor.
  • A. Baltimore and Potomac Tunnel
    The Baltimore and Potomac Tunnel is a 19th-century railroad tunnel in Baltimore, Maryland, that serves as a critical but aging bottleneck on the Northeast Corridor rail line.
  • B. Fort McHenry Tunnel
    The Fort McHenry Tunnel is a major underwater highway tunnel in Baltimore, Maryland, carrying Interstate 95 beneath the harbor near Fort McHenry to ease traffic through the city.
  • C. Baltimore Harbor Tunnel
    The Baltimore Harbor Tunnel is a vehicular tunnel in Baltimore, Maryland, that carries Interstate 895 beneath the harbor as a major route for traffic bypassing downtown.
  • D. Howard Street Tunnel
    The Howard Street Tunnel is a historic railroad tunnel in Baltimore, Maryland, that carries freight trains beneath the city’s downtown.
  • E. Potomac River tunnel
    The Potomac River tunnel is an underwater rail tunnel in the Washington, D.C. area that carries Washington Metro trains beneath the Potomac River.
  • F. None of above. chosen

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: Union Tunnel (Baltimore)
Triple: [Baltimore rail network, hasStructure, Union Tunnel (Baltimore)]
Generated description
Union Tunnel in Baltimore is a historic railroad tunnel that carries passenger and freight trains beneath the city as part of the Northeast Corridor.

Provenance (5 batches)

Stage Batch ID Job type Status
creating batch_69d6ab4780948190bdb9f7620c2ac27e elicitation completed
NER batch_69d9043dbccc8190bf9da181f826f0d8 ner completed
NED1 batch_69f61e3ee53c81909c2e4620a12a46da ned_source_triple completed
NED2 batch_69f61fa2073881909f683966772bd6b2 ned_description completed
NEDg batch_69f61f0dc1e08190bfd2452287d534c9 nedg completed
Created at: April 8, 2026, 9:47 p.m.