Seibu Ikebukuro Line
E160312
The Seibu Ikebukuro Line is a major private railway line in the Tokyo area operated by Seibu Railway, connecting Ikebukuro in central Tokyo with suburban destinations in Saitama Prefecture.
All labels observed (5)
How this entity was disambiguated
This entity first appeared as the object of triple T1102245 — 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: Seibu Ikebukuro Line Context triple: [Tokyo Metro Fukutoshin Line, throughServiceWith, Seibu Ikebukuro Line]
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A.
Seibu Yurakucho Line
The Seibu Yurakucho Line is a commuter railway line in Tokyo operated by Seibu Railway, linking the Seibu Ikebukuro Line with central Tokyo subway networks.
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B.
Tokyu Den-en-toshi Line
Tokyu Den-en-toshi Line is a major private railway line in the Tokyo metropolitan area that connects central Tokyo with suburban residential districts, including service to Shibuya.
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C.
Tokyu Toyoko Line
The Tokyu Toyoko Line is a major private railway line in the Tokyo–Yokohama area that connects central Tokyo with Yokohama and links to multiple subway and intercity rail services.
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D.
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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E.
Tokyo Metro Fukutoshin Line
The Tokyo Metro Fukutoshin Line is a major Tokyo subway line running north–south through central and suburban areas, connecting key hubs such as Shibuya with other important districts.
- 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: Seibu Ikebukuro Line Target entity description: The Seibu Ikebukuro Line is a major private railway line in the Tokyo area operated by Seibu Railway, connecting Ikebukuro in central Tokyo with suburban destinations in Saitama Prefecture.
-
A.
Seibu Yurakucho Line
The Seibu Yurakucho Line is a commuter railway line in Tokyo operated by Seibu Railway, linking the Seibu Ikebukuro Line with central Tokyo subway networks.
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B.
Tokyu Den-en-toshi Line
Tokyu Den-en-toshi Line is a major private railway line in the Tokyo metropolitan area that connects central Tokyo with suburban residential districts, including service to Shibuya.
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C.
Tokyu Toyoko Line
The Tokyu Toyoko Line is a major private railway line in the Tokyo–Yokohama area that connects central Tokyo with Yokohama and links to multiple subway and intercity rail services.
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D.
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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E.
Tokyo Metro Fukutoshin Line
The Tokyo Metro Fukutoshin Line is a major Tokyo subway line running north–south through central and suburban areas, connecting key hubs such as Shibuya with other important districts.
- F. None of above. chosen
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
commuter rail line
ⓘ
railway line in Japan ⓘ |
| connectsSuburbanArea | Hannō ⓘ |
| connectsTo |
Tokyo Metro Fukutoshin Line
ⓘ
Tokyo Metro Yurakucho Line ⓘ
linked to:
Tokyo Metro Yurakuchō Line
|
| connectsUrbanCenter | Ikebukuro ⓘ |
| country | Japan ⓘ |
| electrification | 1500 V DC overhead catenary ⓘ |
| endingPoint | Hannō Station NERFINISHED ⓘ |
| fareSystem | integrated with Seibu Railway fare system ⓘ |
| gauge | 1067 mm ⓘ |
| lineLength | approximately 57.8 km ⓘ |
| locatedIn |
Japan
ⓘ
Saitama Prefecture ⓘ Tokyo ⓘ |
| majorHubStation |
Hoya Station
ⓘ
Shakujii-kōen Station NERFINISHED ⓘ Tokorozawa Station NERFINISHED ⓘ |
| numberOfStations | around 30 ⓘ |
| opened | 1915 ⓘ |
| operator | Seibu Railway ⓘ |
| owner | Seibu Railway ⓘ |
| partOfNetwork |
Seibu Railway network
ⓘ
linked to:
Seibu Railway
|
| primaryStation | Ikebukuro Station ⓘ |
| railwayCompanyType | private railway ⓘ |
| regionServed |
northwestern Tokyo suburbs
ⓘ
southern Saitama Prefecture ⓘ |
| rollingStockOperator | Seibu Railway ⓘ |
| serviceType |
express
ⓘ
limited express ⓘ local ⓘ rapid ⓘ |
| startingPoint | Ikebukuro Station ⓘ |
| terminus |
Agano Station
NERFINISHED
ⓘ
Hannō Station NERFINISHED ⓘ Ikebukuro Station ⓘ Seibu Chichibu Station NERFINISHED ⓘ |
| throughServicesTo |
Minatomirai Line
ⓘ
Tobu Tojo Line ⓘ Tokyu Toyoko Line ⓘ |
| trackConfiguration |
double track on most sections
ⓘ
single track on some rural sections ⓘ |
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: Seibu Ikebukuro Line Description of subject: The Seibu Ikebukuro Line is a major private railway line in the Tokyo area operated by Seibu Railway, connecting Ikebukuro in central Tokyo with suburban destinations in Saitama Prefecture.
Referenced by (38)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Seibu Ikebukuro Line
linked to: Seibu Ikebukuro Line
subject linked to:
Tokyo Metro Yurakucho Line (at Ikebukuro Station)
subject linked to:
Tokyo Metro Fukutoshin Line (at Ikebukuro Station)
linked to: Seibu Ikebukuro Line
linked to: Seibu Ikebukuro Line