Chūō Main Line
E338417
The Chūō Main Line is a major Japanese railway line operated by JR that runs through central Tokyo and connects the capital with inland regions such as Nagano via key urban hubs.
All labels observed (7)
| Label | Occurrences |
|---|---|
| Chūō Main Line canonical | 4 |
| JR Chūō Line | 4 |
| Chuo Main Line | 2 |
| JR Chūō Main Line | 2 |
| Chūō Main Line (via Yamanashi and Nagano) | 1 |
| JR Chuo Main Line | 1 |
| 中央本線 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1603468 — 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: Chūō Main Line Context triple: [Shinjuku Station, servedByLine, Chūō Main Line]
-
A.
Kansai Main Line
The Kansai Main Line is a major railway line in Japan’s Kansai region that connects key cities including Osaka and Nagoya, serving both commuter and intercity traffic.
-
B.
Keiyō Line
The Keiyō Line is a JR East railway line in the Tokyo area that runs along Tokyo Bay, connecting central Tokyo with destinations such as Maihama (Tokyo Disney Resort) and Chiba.
-
C.
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.
-
D.
Tōkaidō Main Line
The Tōkaidō Main Line is one of Japan’s most important and heavily used railway corridors, linking Tokyo with Osaka and other major cities along the historic Tōkaidō route.
-
E.
Chuo Line
The Chuo Line is a major rapid transit line in the Osaka Metro system that runs east–west through central Osaka, connecting key commercial and residential 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: Chūō Main Line Target entity description: The Chūō Main Line is a major Japanese railway line operated by JR that runs through central Tokyo and connects the capital with inland regions such as Nagano via key urban hubs.
-
A.
Kansai Main Line
The Kansai Main Line is a major railway line in Japan’s Kansai region that connects key cities including Osaka and Nagoya, serving both commuter and intercity traffic.
-
B.
Keiyō Line
The Keiyō Line is a JR East railway line in the Tokyo area that runs along Tokyo Bay, connecting central Tokyo with destinations such as Maihama (Tokyo Disney Resort) and Chiba.
-
C.
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.
-
D.
Tōkaidō Main Line
The Tōkaidō Main Line is one of Japan’s most important and heavily used railway corridors, linking Tokyo with Osaka and other major cities along the historic Tōkaidō route.
-
E.
Chuo Line
The Chuo Line is a major rapid transit line in the Osaka Metro system that runs east–west through central Osaka, connecting key commercial and residential districts.
- F. None of above. chosen
Statements (51)
| Predicate | Object |
|---|---|
| instanceOf |
main line
ⓘ
railway line ⓘ |
| connects |
Nagoya
ⓘ
Tokyo ⓘ inland regions of central Honshu ⓘ |
| connectsTo |
Chūō Line (Rapid)
NERFINISHED
ⓘ
Chūō-Sōbu Line NERFINISHED ⓘ Sōbu Main Line NERFINISHED ⓘ Yamanote Line NERFINISHED ⓘ |
| country | Japan ⓘ |
| electrification | 1,500 V DC overhead catenary ⓘ |
| historicalOperator |
Japanese Government Railways
ⓘ
Japanese National Railways ⓘ |
| limitedExpressService |
Azusa
ⓘ
Kaiji ⓘ Super Azusa ⓘ |
| lineColorInTokyoArea | orange ⓘ |
| locale |
Aichi Prefecture
NERFINISHED
ⓘ
Gifu Prefecture NERFINISHED ⓘ Kanagawa Prefecture NERFINISHED ⓘ Nagano Prefecture NERFINISHED ⓘ Tokyo ⓘ Yamanashi Prefecture NERFINISHED ⓘ |
| majorStation |
Chikuma Station
NERFINISHED
ⓘ
Kōfu Station NERFINISHED ⓘ Nakatsugawa Station NERFINISHED ⓘ Shinjuku Station NERFINISHED ⓘ Shiojiri Station NERFINISHED ⓘ Tajimi Station NERFINISHED ⓘ |
| nativeName |
中央本線
ⓘ
linked to:
Chūō Main Line
|
| opened | 1889 ⓘ |
| operator |
Central Japan Railway Company
ⓘ
East Japan Railway Company ⓘ |
| owner |
Central Japan Railway Company
ⓘ
East Japan Railway Company ⓘ |
| partOfNetwork |
JR Central network
ⓘ
JR East urban network ⓘ |
| passesThrough |
Chūō region
ⓘ
Ina Valley ⓘ Kiso Valley ⓘ Kōfu Basin ⓘ |
| railGauge | 1,067 mm ⓘ |
| region |
Chūbu region
ⓘ
Kantō region ⓘ |
| serviceType |
commuter rail
ⓘ
intercity rail ⓘ limited express services ⓘ |
| terminus |
Nagoya Station
NERFINISHED
ⓘ
Tokyo Station NERFINISHED ⓘ |
| trackGauge | Cape gauge ⓘ |
| usesSignaling | automatic block signaling ⓘ |
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: Chūō Main Line Description of subject: The Chūō Main Line is a major Japanese railway line operated by JR that runs through central Tokyo and connects the capital with inland regions such as Nagano via key urban hubs.
Referenced by (15)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Chūō Main Line
linked to: Chūō Main Line
linked to: Chūō Main Line
linked to: Chūō Main Line
linked to: Chūō Main Line
linked to: Chūō Main Line
linked to: Chūō Main Line
linked to: Chūō Main Line
linked to: Chūō Main Line
linked to: Chūō Main Line
linked to: Chūō Main Line