Marunouchi Line
E390381
The Marunouchi Line is one of Tokyo’s main subway lines, forming a central loop and radial route that connects key business, shopping, and transit hubs across the city.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Marunouchi Line canonical | 2 |
| Marunouchi Line Honancho branch | 1 |
| Marunouchi Line Hōnanchō branch | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1860669 — 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: Marunouchi Line Context triple: [Tokyo Metro, operatesLine, Marunouchi Line]
-
A.
Sennichimae Line
The Sennichimae Line is a rapid transit line in Osaka, Japan, forming part of the city’s urban subway network.
-
B.
Imazatosuji Line
The Imazatosuji Line is a rapid transit line in Osaka, Japan, operated by Osaka Metro and serving as one of the city’s main north–south subway corridors.
-
C.
Takasaki Line
The Takasaki Line is a major railway line in Japan operated by JR East that connects the Tokyo metropolitan area with Saitama and Gunma Prefectures, serving as an important commuter and intercity route.
-
D.
Takashinohama Line
The Takashinohama Line is a short commuter railway line in Osaka Prefecture, Japan, operated by Nankai Electric Railway and serving local passenger traffic.
-
E.
Nagahori Tsurumi-ryokuchi Line
The Nagahori Tsurumi-ryokuchi Line is a major Osaka Metro subway line in Osaka, Japan, known for being the country’s first full-scale linear motor-powered urban railway line.
- 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: Marunouchi Line Target entity description: The Marunouchi Line is one of Tokyo’s main subway lines, forming a central loop and radial route that connects key business, shopping, and transit hubs across the city.
-
A.
Sennichimae Line
The Sennichimae Line is a rapid transit line in Osaka, Japan, forming part of the city’s urban subway network.
-
B.
Imazatosuji Line
The Imazatosuji Line is a rapid transit line in Osaka, Japan, operated by Osaka Metro and serving as one of the city’s main north–south subway corridors.
-
C.
Takasaki Line
The Takasaki Line is a major railway line in Japan operated by JR East that connects the Tokyo metropolitan area with Saitama and Gunma Prefectures, serving as an important commuter and intercity route.
-
D.
Takashinohama Line
The Takashinohama Line is a short commuter railway line in Osaka Prefecture, Japan, operated by Nankai Electric Railway and serving local passenger traffic.
-
E.
Nagahori Tsurumi-ryokuchi Line
The Nagahori Tsurumi-ryokuchi Line is a major Osaka Metro subway line in Osaka, Japan, known for being the country’s first full-scale linear motor-powered urban railway line.
- F. None of above. chosen
Statements (53)
| Predicate | Object |
|---|---|
| instanceOf |
Tokyo Metro line
ⓘ
railway line in Japan ⓘ subway line ⓘ |
| branchTerminus |
Hōnanchō Station
NERFINISHED
ⓘ
Nakano-sakaue Station NERFINISHED ⓘ |
| completionDateBranch | 1961-02-08 ⓘ |
| completionDateMainLine | 1962-03-23 ⓘ |
| country | Japan ⓘ |
| depot |
Koishikawa Depot
ⓘ
Nakano Depot ⓘ |
| electrification | 600 V DC third rail ⓘ |
| fareSystem | Tokyo Metro fare system ⓘ |
| firstSectionOpened | Ikebukuro–Ochanomizu section ⓘ |
| formerOperator | Teito Rapid Transit Authority ⓘ |
| formerRollingStock |
TRTA 300 series
ⓘ
TRTA 3000 series ⓘ TRTA 500 series ⓘ Tokyo Metro 02 series (former) ⓘ
surface form:
Tokyo Metro 02 series
|
| gauge | 1,435 mm standard gauge ⓘ |
| hasBranch |
Marunouchi Line
self-linksurface differs
ⓘ
surface form:
Marunouchi Line Hōnanchō branch
|
| interchangeWith |
Chiyoda Line
NERFINISHED
ⓘ
Chūō Main Line NERFINISHED ⓘ Fukutoshin Line NERFINISHED ⓘ Ginza Line NERFINISHED ⓘ Hanzōmon Line NERFINISHED ⓘ Hibiya Line NERFINISHED ⓘ JR East lines at major hubs ⓘ Namboku Line NERFINISHED ⓘ Tōzai Line NERFINISHED ⓘ Yamanote Line NERFINISHED ⓘ |
| lineCode | M ⓘ |
| lineColor | red ⓘ |
| lineSymbol | M ⓘ |
| locatedIn | Tokyo ⓘ |
| networkRole | central Tokyo radial and loop-like route ⓘ |
| numberOfStations |
25 on main line
ⓘ
28 ⓘ 3 on Hōnanchō branch ⓘ |
| openingDate | 1954-01-20 ⓘ |
| operator | Tokyo Metro ⓘ |
| rollingStock | Tokyo Metro 2000 series ⓘ |
| servesArea |
Ikebukuro
NERFINISHED
ⓘ
Marunouchi business district NERFINISHED ⓘ Ochanomizu ⓘ Shinjuku ⓘ Tokyo Station area (Yaesu side) ⓘ
surface form:
Tokyo Station area
Yotsuya ⓘ |
| servicePattern | all-stations stopping ⓘ |
| smartCardAccepted |
PASMO
ⓘ
Suica ⓘ |
| terminus |
Ikebukuro Station
NERFINISHED
ⓘ
Ogikubo Station NERFINISHED ⓘ |
| trackConfiguration | double 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: Marunouchi Line Description of subject: The Marunouchi Line is one of Tokyo’s main subway lines, forming a central loop and radial route that connects key business, shopping, and transit hubs across the city.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Marunouchi Line Honancho branch
this entity surface form:
Marunouchi Line Hōnanchō branch