United States Capitol Subway System

E541364

intra-campus rail transit system underground people mover system

The United States Capitol Subway System is a small network of underground rail lines that transports members of Congress and staff between the Capitol and nearby congressional office buildings in Washington, D.C.

Try in SPARQL Jump to: Surface forms Disambiguation Statements Elicitation Referenced by

All labels observed (3)

Label	Occurrences
United States Capitol Subway System canonical	2
Capitol subway system	1
House Subway System	1

How this entity was disambiguated

This entity first appeared as the object of triple T5722559 — 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: United States Capitol Subway System
Context triple: [House of Representatives office buildings, connectedTo, United States Capitol Subway System]

A. Washington Metro
Washington Metro is the rapid transit system serving the Washington, D.C. metropolitan area, known for its extensive rail network connecting the city with its suburbs in Maryland and Virginia.
B. Roosevelt Island Tramway
The Roosevelt Island Tramway is an aerial cable car system in New York City that connects Roosevelt Island to Manhattan, offering both public transit and scenic views of the skyline.
C. Union Station (Washington Metro)
Union Station is a major Washington Metro station in Washington, D.C., serving as a key transit hub connected to the historic Union Station rail terminal and multiple local and regional transportation services.
D. Smithsonian Metro station
Smithsonian Metro station is a Washington, D.C. Metrorail stop on the National Mall that serves major museums and monuments including the Smithsonian Institution.
E. Metrorail
Metrorail is the rapid transit system serving the Washington, D.C. metropolitan area, operated by the Washington Metropolitan Area Transit Authority (WMATA).
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: United States Capitol Subway System
Target entity description: The United States Capitol Subway System is a small network of underground rail lines that transports members of Congress and staff between the Capitol and nearby congressional office buildings in Washington, D.C.

A. Washington Metro
Washington Metro is the rapid transit system serving the Washington, D.C. metropolitan area, known for its extensive rail network connecting the city with its suburbs in Maryland and Virginia.
B. Roosevelt Island Tramway
The Roosevelt Island Tramway is an aerial cable car system in New York City that connects Roosevelt Island to Manhattan, offering both public transit and scenic views of the skyline.
C. Union Station (Washington Metro)
Union Station is a major Washington Metro station in Washington, D.C., serving as a key transit hub connected to the historic Union Station rail terminal and multiple local and regional transportation services.
D. Smithsonian Metro station
Smithsonian Metro station is a Washington, D.C. Metrorail stop on the National Mall that serves major museums and monuments including the Smithsonian Institution.
E. Metrorail
Metrorail is the rapid transit system serving the Washington, D.C. metropolitan area, operated by the Washington Metropolitan Area Transit Authority (WMATA).
F. None of above. chosen

Statements (47)

Predicate	Object
instanceOf	intra-campus rail transit system ⓘ underground people mover system ⓘ
accessPolicy	primarily restricted to congressional use ⓘ
cityServed	Washington, D.C. ⓘ
connects	Cannon House Office Building ⓘ Dirksen Senate Office Building ⓘ Hart Senate Office Building ⓘ Longworth House Office Building ⓘ Rayburn House Office Building ⓘ Russell Senate Office Building ⓘ United States Capitol ⓘ
country	United States of America ⓘ
fareSystem	free of charge ⓘ
hasFeature	dedicated tunnels between buildings ⓘ short-distance shuttle operations ⓘ
hasInfrastructureType	station platforms ⓘ tunnel ⓘ
hasLine	House Subway ⓘ Senate Subway ⓘ linked to: Senate Subway System
hasRollingStockType	automated small trains ⓘ open-air electric cars ⓘ
hasSection	House open car shuttle between Capitol and Rayburn ⓘ Senate automated train between Hart and Dirksen ⓘ Senate open car shuttle between Capitol and Russell ⓘ
isUnderground	true ⓘ
locatedIn	United States Capitol Complex ⓘ
location	Washington, D.C. ⓘ
notPublicTransit	true ⓘ
opened	1909 ⓘ
operator	Architect of the Capitol ⓘ
owner	United States federal government ⓘ linked to: United States government
partOf	infrastructure of the United States Capitol Complex ⓘ
primaryUsers	congressional staff ⓘ members of the United States Congress ⓘ
propulsion	electric ⓘ
purpose	transportation of congressional staff ⓘ transportation of legislators ⓘ
region	Capitol Hill ⓘ
safetyFeature	escort requirements for visitors ⓘ
securityJurisdiction	United States Capitol Police ⓘ
serves	House office buildings ⓘ Senate office buildings ⓘ United States Capitol ⓘ
trackGauge	narrow-gauge ⓘ
usedBy	United States Representatives ⓘ linked to: U.S. Representative United States Senators ⓘ linked to: United States Senator authorized visitors ⓘ

How these facts were elicited

Referenced by (4)

Full triples — surface form annotated when it differs from this entity's canonical label.

House of Representatives office buildings → connectedTo → United States Capitol Subway System ⓘ

Senate office buildings → connectedTo → United States Capitol Subway System ⓘ

Senate Subway System → partOf → Capitol subway system ⓘ

linked to: United States Capitol Subway System

Senate Subway System → hasCounterpart → House Subway System ⓘ