Keisei Main Line
E875077
The Keisei Main Line is a major private railway line in the Tokyo area operated by Keisei Electric Railway, connecting central Tokyo with Narita and Chiba Prefecture.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Keisei Main Line canonical | 37 |
| Keisei Main Line (in Narita area) | 1 |
| Keisei Main Line at Nippori | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6547110 — 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: Keisei Main Line Context triple: [Ueno, railwayLinesServedBy, Keisei Main Line]
-
A.
Nippō Main Line
The Nippō Main Line is a major railway line in Kyushu, Japan, operated by JR Kyushu and running along the eastern coast to connect key cities including Beppu, Oita, and Miyazaki.
-
B.
Keikyū Main Line
The Keikyū Main Line is a major private railway line in the Greater Tokyo area of Japan, operated by Keikyu Corporation and serving as a key commuter route between central Tokyo and cities in Kanagawa Prefecture.
-
C.
Kisei Main Line
The Kisei Main Line is a major railway line in Japan that runs along the Kii Peninsula, connecting cities in Osaka, Wakayama, and Mie Prefectures along the Pacific coast.
-
D.
Seto-Ōhashi Line
The Seto-Ōhashi Line is a railway route in Japan that connects Honshu and Shikoku across the Seto Inland Sea, forming the rail link over the Great Seto Bridge system.
-
E.
Keihan Main Line
The Keihan Main Line is a major Japanese railway line operated by Keihan Electric Railway, connecting Osaka and Kyoto and serving as a key commuter and intercity route in the Kansai region.
- 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: Keisei Main Line Target entity description: The Keisei Main Line is a major private railway line in the Tokyo area operated by Keisei Electric Railway, connecting central Tokyo with Narita and Chiba Prefecture.
-
A.
Nippō Main Line
The Nippō Main Line is a major railway line in Kyushu, Japan, operated by JR Kyushu and running along the eastern coast to connect key cities including Beppu, Oita, and Miyazaki.
-
B.
Keikyū Main Line
The Keikyū Main Line is a major private railway line in the Greater Tokyo area of Japan, operated by Keikyu Corporation and serving as a key commuter route between central Tokyo and cities in Kanagawa Prefecture.
-
C.
Kisei Main Line
The Kisei Main Line is a major railway line in Japan that runs along the Kii Peninsula, connecting cities in Osaka, Wakayama, and Mie Prefectures along the Pacific coast.
-
D.
Seto-Ōhashi Line
The Seto-Ōhashi Line is a railway route in Japan that connects Honshu and Shikoku across the Seto Inland Sea, forming the rail link over the Great Seto Bridge system.
-
E.
Keihan Main Line
The Keihan Main Line is a major Japanese railway line operated by Keihan Electric Railway, connecting Osaka and Kyoto and serving as a key commuter and intercity route in the Kansai region.
- F. None of above. chosen
Statements (36)
| Predicate | Object |
|---|---|
| instanceOf |
commuter rail line
ⓘ
railway line ⓘ |
| connectsTo |
Chiba Prefecture
NERFINISHED
ⓘ
Narita area ⓘ central Tokyo ⓘ |
| country | Japan ⓘ |
| electrification | 1,500 V DC overhead catenary ⓘ |
| gauge | 1,435 mm standard gauge ⓘ |
| hasRole | major route to Narita International Airport ⓘ |
| hasThroughServicesWith |
Keikyu Main Line
ⓘ
linked to:
Keikyū Main Line
Keisei Oshiage Line ⓘ Toei Asakusa Line ⓘ |
| isPrivateRailway | true ⓘ |
| locatedIn |
Chiba Prefecture
NERFINISHED
ⓘ
Japan ⓘ Tokyo Prefecture ⓘ |
| operator | Keisei Electric Railway ⓘ |
| owner | Keisei Electric Railway ⓘ |
| partOf |
Keisei Electric Railway network
ⓘ
linked to:
Keisei Electric Railway
|
| primaryFunction |
connect central Tokyo with Chiba Prefecture
ⓘ
connect central Tokyo with Narita area ⓘ |
| regionServed |
Greater Tokyo Area
ⓘ
linked to:
Tokyo metropolitan area
|
| serves |
airport passengers
ⓘ
commuters ⓘ |
| serviceType |
airport express
ⓘ
limited express ⓘ local ⓘ rapid ⓘ |
| status | in operation ⓘ |
| terminus |
Keisei Ueno Station
NERFINISHED
ⓘ
Narita Airport Station ⓘ
linked to:
Narita Airport Terminal 1 Station
Narita Airport Terminal 1 Station ⓘ Narita Airport Terminal 2·3 Station ⓘ |
| trackConfiguration | double track on most sections ⓘ |
| transportMode | rail ⓘ |
| usesRollingStockOf | Keisei Electric Railway ⓘ |
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: Keisei Main Line Description of subject: The Keisei Main Line is a major private railway line in the Tokyo area operated by Keisei Electric Railway, connecting central Tokyo with Narita and Chiba Prefecture.
Referenced by (39)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
Arakawa district
subject linked to:
Higashi-Nippori district
linked to: Keisei Main Line
subject linked to:
Horikiri
linked to: Keisei Main Line
subject linked to:
western Chiba Prefecture