Ikebukuro–Ochanomizu section
E909227
The Ikebukuro–Ochanomizu section is an early central Tokyo subway corridor linking the Ikebukuro area with the Ochanomizu district as part of the Tokyo Metro Marunouchi Line.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Ikebukuro–Ochanomizu section canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T11161500 — 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: Ikebukuro–Ochanomizu section Context triple: [Tokyo Metro Marunouchi Line, openedSection, Ikebukuro–Ochanomizu section]
-
A.
Narita Line (urban section)
Narita Line (urban section) is a commuter rail line in the Greater Tokyo area operated by JR East, connecting central Chiba with Narita and serving as part of the region’s urban rail network.
-
B.
Keio Inokashira Line
The Keio Inokashira Line is a private railway line in Tokyo operated by Keio Corporation, connecting Shibuya with the western suburb of Kichijōji and serving several popular residential and commercial districts along the way.
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C.
Hanzomon Line
The Hanzomon Line is a major Tokyo Metro subway line in Tokyo, Japan, running east–west through central districts and providing key commuter connections across the city.
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D.
Toei Asakusa Line
The Toei Asakusa Line is a major Tokyo subway line operated by the Tokyo Metropolitan Bureau of Transportation, connecting central Tokyo with surrounding areas and offering through-services to several private railway lines.
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E.
Toei Oedo Line
The Toei Oedo Line is a major Tokyo subway loop and radial line operated by the Tokyo Metropolitan Bureau of Transportation, connecting central districts with many key commercial and residential areas.
- 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: Ikebukuro–Ochanomizu section Target entity description: The Ikebukuro–Ochanomizu section is an early central Tokyo subway corridor linking the Ikebukuro area with the Ochanomizu district as part of the Tokyo Metro Marunouchi Line.
-
A.
Narita Line (urban section)
Narita Line (urban section) is a commuter rail line in the Greater Tokyo area operated by JR East, connecting central Chiba with Narita and serving as part of the region’s urban rail network.
-
B.
Keio Inokashira Line
The Keio Inokashira Line is a private railway line in Tokyo operated by Keio Corporation, connecting Shibuya with the western suburb of Kichijōji and serving several popular residential and commercial districts along the way.
-
C.
Hanzomon Line
The Hanzomon Line is a major Tokyo Metro subway line in Tokyo, Japan, running east–west through central districts and providing key commuter connections across the city.
-
D.
Toei Asakusa Line
The Toei Asakusa Line is a major Tokyo subway line operated by the Tokyo Metropolitan Bureau of Transportation, connecting central Tokyo with surrounding areas and offering through-services to several private railway lines.
-
E.
Toei Oedo Line
The Toei Oedo Line is a major Tokyo subway loop and radial line operated by the Tokyo Metropolitan Bureau of Transportation, connecting central districts with many key commercial and residential areas.
- F. None of above. chosen
Statements (25)
| Predicate | Object |
|---|---|
| instanceOf |
railway line section
ⓘ
subway corridor ⓘ |
| city | Tokyo ⓘ |
| connects |
Ikebukuro
NERFINISHED
ⓘ
Ochanomizu NERFINISHED ⓘ |
| country | Japan ⓘ |
| electrification | 1,500 V DC overhead catenary ⓘ |
| hasMode | rail transport ⓘ |
| hasTrackConfiguration | double track ⓘ |
| isPartOfTransportSystem | Tokyo subway NERFINISHED ⓘ |
| lineColor | red ⓘ |
| locatedIn |
Japan
ⓘ
Tokyo ⓘ central Tokyo NERFINISHED ⓘ |
| operator | Tokyo Metro NERFINISHED ⓘ |
| ownedBy | Tokyo Metro NERFINISHED ⓘ |
| partOf |
Tokyo Metro Marunouchi Line
NERFINISHED
ⓘ
central Tokyo subway network NERFINISHED ⓘ |
| railwayType | underground metro ⓘ |
| servedBy | Tokyo Metro Marunouchi Line trains NERFINISHED ⓘ |
| servesDistrict |
Ikebukuro area
NERFINISHED
ⓘ
Ochanomizu district NERFINISHED ⓘ |
| terminusAt |
Ikebukuro Station
NERFINISHED
ⓘ
Ochanomizu Station NERFINISHED ⓘ |
| uses | standard gauge track ⓘ |
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: Ikebukuro–Ochanomizu section Description of subject: The Ikebukuro–Ochanomizu section is an early central Tokyo subway corridor linking the Ikebukuro area with the Ochanomizu district as part of the Tokyo Metro Marunouchi Line.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.