Eidan Subway
E622569
Eidan Subway was the former name of Tokyo’s main rapid transit system, operated by the Teito Rapid Transit Authority before it became Tokyo Metro.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Eidan Subway canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6819194 — 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: Eidan Subway Context triple: [Teito Rapid Transit Authority, alsoKnownAs, Eidan Subway]
-
A.
Sendai Subway
Sendai Subway is an urban rapid transit system serving the city of Sendai in Japan, providing key north–south and east–west rail connections across the metropolitan area.
-
B.
Hell's Gate Airtram
Hell's Gate Airtram is a scenic aerial tramway in British Columbia that carries visitors over the turbulent Fraser River through the dramatic Fraser Canyon.
-
C.
Sheppard subway
Sheppard subway is a Toronto Transit Commission rapid transit line in North York that runs east–west along Sheppard Avenue.
-
D.
Central Subway
Central Subway is a light rail extension of San Francisco’s Muni Metro system that provides improved north–south transit service, including a key connection to the Chinatown neighborhood.
-
E.
Länsimetro
Länsimetro is a major westward extension of the Helsinki Metro that connects central Helsinki with the neighboring city of Espoo through a series of new underground stations.
- 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: Eidan Subway Target entity description: Eidan Subway was the former name of Tokyo’s main rapid transit system, operated by the Teito Rapid Transit Authority before it became Tokyo Metro.
-
A.
Sendai Subway
Sendai Subway is an urban rapid transit system serving the city of Sendai in Japan, providing key north–south and east–west rail connections across the metropolitan area.
-
B.
Hell's Gate Airtram
Hell's Gate Airtram is a scenic aerial tramway in British Columbia that carries visitors over the turbulent Fraser River through the dramatic Fraser Canyon.
-
C.
Sheppard subway
Sheppard subway is a Toronto Transit Commission rapid transit line in North York that runs east–west along Sheppard Avenue.
-
D.
Central Subway
Central Subway is a light rail extension of San Francisco’s Muni Metro system that provides improved north–south transit service, including a key connection to the Chinatown neighborhood.
-
E.
Länsimetro
Länsimetro is a major westward extension of the Helsinki Metro that connects central Helsinki with the neighboring city of Espoo through a series of new underground stations.
- F. None of above. chosen
Statements (29)
| Predicate | Object |
|---|---|
| instanceOf |
rapid transit system
ⓘ
subway system ⓘ |
| abbreviation | TRTA NERFINISHED ⓘ |
| alsoKnownAs | Teito Rapid Transit Authority subway NERFINISHED ⓘ |
| country | Japan ⓘ |
| electrification | electric railway ⓘ |
| fareMedium |
commuter passes
ⓘ
magnetic tickets ⓘ |
| fareSystem | distance-based fare system ⓘ |
| formerNameOf | Tokyo Metro NERFINISHED ⓘ |
| gauge | standard gauge (for most lines) ⓘ |
| hasRollingStockType | electric multiple units ⓘ |
| infrastructureOwner | Teito Rapid Transit Authority NERFINISHED ⓘ |
| locatedIn | Tokyo ⓘ |
| locatedInTimeZone | Japan Standard Time ⓘ |
| operatedBy | Teito Rapid Transit Authority NERFINISHED ⓘ |
| operator | Teito Rapid Transit Authority NERFINISHED ⓘ |
| partOf | Tokyo public transportation network NERFINISHED ⓘ |
| primaryLanguageOfSignage | Japanese ⓘ |
| primaryMode | underground railway ⓘ |
| publicOrPrivate | public ⓘ |
| reorganizedAs | Tokyo Metro NERFINISHED ⓘ |
| secondaryLanguageOfSignage | English ⓘ |
| servedCity | Tokyo NERFINISHED ⓘ |
| servedRegion | Kantō region NERFINISHED ⓘ |
| serviceArea | Tokyo Metropolis NERFINISHED ⓘ |
| status | defunct ⓘ |
| successorTo | Eidan Subway NERFINISHED ⓘ |
| transportType | urban rail ⓘ |
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: Eidan Subway Description of subject: Eidan Subway was the former name of Tokyo’s main rapid transit system, operated by the Teito Rapid Transit Authority before it became Tokyo Metro.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.