Teito Rapid Transit Authority
E156852
Teito Rapid Transit Authority was the former public operator of several Tokyo subway lines before its privatization and reorganization as Tokyo Metro.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Teito Rapid Transit Authority canonical | 12 |
| Tokyo Metro Co., Ltd. | 4 |
| Tokyo Metro (TRTA) engineering division | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1126178 — 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: Teito Rapid Transit Authority Context triple: [Tokyo Metro Ginza Line, formerOperator, Teito Rapid Transit Authority]
-
A.
Nankai Electric Railway
Nankai Electric Railway is a major private railway company in Japan’s Kansai region, operating key commuter and interurban lines connecting Osaka with Wakayama and Kansai International Airport.
-
B.
Osaka Metro
Osaka Metro is the rapid transit network serving Japan’s city of Osaka and its surrounding urban area.
-
C.
Kintetsu Railway
Kintetsu Railway is a major Japanese private railway operator in the Kansai region, known for its extensive interurban network connecting cities such as Osaka, Nara, Kyoto, and Nagoya.
-
D.
Hanshin Electric Railway Co., Ltd.
Hanshin Electric Railway Co., Ltd. is a Japanese private railway company in the Kansai region, best known in popular culture as the corporate parent of the professional baseball team Hanshin Tigers.
-
E.
Hankyu Railway
Hankyu Railway is a major private railway operator in the Kansai region of Japan, known for its extensive commuter network linking Osaka with Kyoto and Kobe.
- 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: Teito Rapid Transit Authority Target entity description: Teito Rapid Transit Authority was the former public operator of several Tokyo subway lines before its privatization and reorganization as Tokyo Metro.
-
A.
Nankai Electric Railway
Nankai Electric Railway is a major private railway company in Japan’s Kansai region, operating key commuter and interurban lines connecting Osaka with Wakayama and Kansai International Airport.
-
B.
Osaka Metro
Osaka Metro is the rapid transit network serving Japan’s city of Osaka and its surrounding urban area.
-
C.
Kintetsu Railway
Kintetsu Railway is a major Japanese private railway operator in the Kansai region, known for its extensive interurban network connecting cities such as Osaka, Nara, Kyoto, and Nagoya.
-
D.
Hanshin Electric Railway Co., Ltd.
Hanshin Electric Railway Co., Ltd. is a Japanese private railway company in the Kansai region, best known in popular culture as the corporate parent of the professional baseball team Hanshin Tigers.
-
E.
Hankyu Railway
Hankyu Railway is a major private railway operator in the Kansai region of Japan, known for its extensive commuter network linking Osaka with Kyoto and Kobe.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
government-owned corporation
ⓘ
public transport operator ⓘ |
| alsoKnownAs |
Eidan Subway
ⓘ
TRTA ⓘ |
| country | Japan ⓘ |
| headquartersLocation | Tokyo ⓘ |
| industry |
public transportation
ⓘ
urban rail transit ⓘ |
| locatedInTimeZone | Japan Standard Time ⓘ |
| operated |
Tokyo Metro Chiyoda Line
ⓘ
surface form:
Chiyoda Line
Fukutoshin Line ⓘ Tokyo Metro Ginza Line ⓘ
surface form:
Ginza Line
Hanzomon Line ⓘ Hibiya Line ⓘ Marunouchi Line ⓘ Namboku Line ⓘ Tokyo metropolitan rail network ⓘ
surface form:
Tokyo subway
Tozai Line ⓘ Tokyo Metro Yurakuchō Line ⓘ
surface form:
Yurakucho Line
|
| operatedIn | Tokyo ⓘ |
| operatedMode | subway ⓘ |
| operationalStatus | defunct ⓘ |
| owner | Government of Japan ⓘ |
| privatizedInto | Tokyo Metro ⓘ |
| reorganizedAs | Tokyo Metro ⓘ |
| replacedBy | Tokyo Metro ⓘ |
| serviceArea |
Tokyo Prefecture
ⓘ
surface form:
Tokyo Metropolis
|
| serviceType | rapid transit ⓘ |
| successor | Tokyo Metro ⓘ |
| transportType | 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: Teito Rapid Transit Authority Description of subject: Teito Rapid Transit Authority was the former public operator of several Tokyo subway lines before its privatization and reorganization as Tokyo Metro.
Referenced by (17)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Tokyo Metro Co., Ltd.
this entity surface form:
Tokyo Metro (TRTA) engineering division
this entity surface form:
Tokyo Metro Co., Ltd.
this entity surface form:
Tokyo Metro Co., Ltd.
this entity surface form:
Tokyo Metro Co., Ltd.