Ōu Main Line
E265563
The Ōu Main Line is a major Japanese railway line in the Tōhoku region that runs north–south through several prefectures, connecting key inland cities and serving as an important intercity and regional transport route.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Ōu Main Line canonical | 2 |
| Ōu Main Line (converted section) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2347129 — 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: Ōu Main Line Context triple: [Yonezawa, Yamagata, Japan, servedByRailLine, Ōu Main Line]
-
A.
Great Eastern Main Line
The Great Eastern Main Line is a major railway route in England connecting London with key towns and cities in Essex, Suffolk, and Norfolk.
-
B.
Watercress Line
The Watercress Line is a preserved heritage railway in Hampshire, England, known for its steam-hauled trains running through the countryside between Alton and Alresford.
-
C.
South Eastern Main Line
The South Eastern Main Line is a major railway route in southeast England connecting London with key towns in Kent and the surrounding region.
-
D.
East Coast Main Line
The East Coast Main Line is a major high-speed railway route in the United Kingdom that runs between London and Edinburgh, serving numerous key cities and regions along the east side of the country.
-
E.
West Coast Main Line
The West Coast Main Line is one of the United Kingdom’s primary intercity railway routes, linking London with major cities such as Birmingham, Manchester, Liverpool, and Glasgow.
- 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: Ōu Main Line Target entity description: The Ōu Main Line is a major Japanese railway line in the Tōhoku region that runs north–south through several prefectures, connecting key inland cities and serving as an important intercity and regional transport route.
-
A.
Great Eastern Main Line
The Great Eastern Main Line is a major railway route in England connecting London with key towns and cities in Essex, Suffolk, and Norfolk.
-
B.
Watercress Line
The Watercress Line is a preserved heritage railway in Hampshire, England, known for its steam-hauled trains running through the countryside between Alton and Alresford.
-
C.
South Eastern Main Line
The South Eastern Main Line is a major railway route in southeast England connecting London with key towns in Kent and the surrounding region.
-
D.
East Coast Main Line
The East Coast Main Line is a major high-speed railway route in the United Kingdom that runs between London and Edinburgh, serving numerous key cities and regions along the east side of the country.
-
E.
West Coast Main Line
The West Coast Main Line is one of the United Kingdom’s primary intercity railway routes, linking London with major cities such as Birmingham, Manchester, Liverpool, and Glasgow.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
heavy rail
ⓘ
railway line ⓘ |
| connectsCity |
Akita
ⓘ
Aomori NERFINISHED ⓘ Fukushima ⓘ Hirosaki ⓘ Semboku ⓘ
surface form:
Shinjō
Yamagata ⓘ |
| connectsWith |
Akita Shinkansen
ⓘ
Tōhoku Shinkansen ⓘ Yamagata Shinkansen ⓘ |
| country | Japan ⓘ |
| electrification |
AC 20 kV overhead line
ⓘ
overhead catenary ⓘ |
| electrificationSystem | 20 kV 50 Hz AC ⓘ |
| formerOwner |
Japanese Government Railways
ⓘ
Japanese National Railways ⓘ |
| gauge | 1,067 mm ⓘ |
| hasSection |
Akita–Aomori section
ⓘ
Fukushima–Yamagata section ⓘ Yamagata–Shinjō section ⓘ
surface form:
Shinjō–Ōmagari section
Yamagata–Shinjō section ⓘ Ōmagari–Akita section ⓘ |
| isPartOf |
JR East rail lines
ⓘ
surface form:
JR East conventional network
|
| lineLength | approximately 484 km ⓘ |
| lineNumber | Ōu Line ⓘ |
| locale |
Akita Prefecture
NERFINISHED
ⓘ
Aomori Prefecture NERFINISHED ⓘ Fukushima Prefecture NERFINISHED ⓘ Yamagata Prefecture NERFINISHED ⓘ |
| openingDate | 1894 ⓘ |
| operator |
East Japan Railway Company
ⓘ
East Japan Railway Company ⓘ
surface form:
JR East
|
| owner | East Japan Railway Company ⓘ |
| passesThrough | inland Tōhoku ⓘ |
| primaryFunction | north–south trunk line in Tōhoku ⓘ |
| railwaySignalling | automatic block ⓘ |
| region |
Tohoku
ⓘ
surface form:
Tōhoku region
|
| serves |
intercity traffic
ⓘ
regional traffic ⓘ |
| serviceType |
limited express trains
ⓘ
local trains ⓘ rapid trains ⓘ |
| startingPoint | Fukushima Station NERFINISHED ⓘ |
| status | in operation ⓘ |
| terminus | Aomori 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: Ōu Main Line Description of subject: The Ōu Main Line is a major Japanese railway line in the Tōhoku region that runs north–south through several prefectures, connecting key inland cities and serving as an important intercity and regional transport route.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Ōu Main Line (converted section)