Potomac River tunnel
E88024
The Potomac River tunnel is an underwater rail tunnel in the Washington, D.C. area that carries Washington Metro trains beneath the Potomac River.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Potomac River crossing | 1 |
| Potomac River tunnel canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T704613 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Potomac River tunnel Context triple: [Yellow Line (Washington Metro), usesTunnel, Potomac River tunnel]
-
A.
Malinta Tunnel
Malinta Tunnel is a historic underground complex on Corregidor Island in the Philippines that served as a bomb-proof headquarters and hospital for American and Filipino forces during World War II.
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B.
Shandaken Tunnel
The Shandaken Tunnel is an aqueduct in New York State that diverts water from the Schoharie Reservoir to the Esopus Creek as part of the New York City water supply system.
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C.
Geneva Spur
Geneva Spur is a branch of the Illinois Prairie Path, a multi-use recreational trail in the Chicago metropolitan area.
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D.
Hudson River tunnels
The Hudson River tunnels are a pair of early 20th-century rail tunnels beneath the Hudson River that carry Amtrak and NJ Transit trains between New Jersey and New York City’s Penn Station.
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E.
Dulles Greenway
Dulles Greenway is a privately owned toll road in Northern Virginia that connects Washington Dulles International Airport with communities in Loudoun County.
- 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: Potomac River tunnel Target entity description: The Potomac River tunnel is an underwater rail tunnel in the Washington, D.C. area that carries Washington Metro trains beneath the Potomac River.
-
A.
Malinta Tunnel
Malinta Tunnel is a historic underground complex on Corregidor Island in the Philippines that served as a bomb-proof headquarters and hospital for American and Filipino forces during World War II.
-
B.
Shandaken Tunnel
The Shandaken Tunnel is an aqueduct in New York State that diverts water from the Schoharie Reservoir to the Esopus Creek as part of the New York City water supply system.
-
C.
Geneva Spur
Geneva Spur is a branch of the Illinois Prairie Path, a multi-use recreational trail in the Chicago metropolitan area.
-
D.
Hudson River tunnels
The Hudson River tunnels are a pair of early 20th-century rail tunnels beneath the Hudson River that carry Amtrak and NJ Transit trains between New Jersey and New York City’s Penn Station.
-
E.
Dulles Greenway
Dulles Greenway is a privately owned toll road in Northern Virginia that connects Washington Dulles International Airport with communities in Loudoun County.
- F. None of above. chosen
Statements (28)
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Potomac River tunnel Description of subject: The Potomac River tunnel is an underwater rail tunnel in the Washington, D.C. area that carries Washington Metro trains beneath the Potomac River.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Yellow Line (Washington Metro)
subject surface form:
Blue Line (Washington Metro)
this entity surface form:
Potomac River crossing