21-series EMU
E336905
The 21-series EMU is a type of electric multiple unit train used for urban rapid transit services on Japan’s Osaka Metro network.
All labels observed (1)
| Label | Occurrences |
|---|---|
| 21-series EMU canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3166446 — 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: 21-series EMU Context triple: [Osaka Metro Midosuji Line, rollingStock, 21-series EMU]
-
A.
201 series EMU
The 201 series EMU is a Japanese electric multiple unit train type introduced by Japanese National Railways in the late 1970s and used extensively on urban commuter lines such as those in the Osaka and Tokyo areas.
-
B.
323 series EMU
The 323 series EMU is a modern Japanese electric multiple unit train operated by JR West, introduced to provide improved comfort, efficiency, and accessibility on urban commuter services.
-
C.
JR West 201 series EMU
The JR West 201 series EMU is a Japanese electric multiple unit train type operated by West Japan Railway Company, primarily used for commuter services in the Kansai region.
-
D.
JR West 223 series EMU
The JR West 223 series EMU is a Japanese electric multiple unit train used for high-frequency suburban and rapid services in the Kansai region.
-
E.
JR West 225 series EMU
The JR West 225 series EMU is a modern Japanese electric multiple unit train designed for high-speed, high-frequency commuter and suburban services with enhanced safety and passenger comfort features.
- 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: 21-series EMU Target entity description: The 21-series EMU is a type of electric multiple unit train used for urban rapid transit services on Japan’s Osaka Metro network.
-
A.
201 series EMU
The 201 series EMU is a Japanese electric multiple unit train type introduced by Japanese National Railways in the late 1970s and used extensively on urban commuter lines such as those in the Osaka and Tokyo areas.
-
B.
323 series EMU
The 323 series EMU is a modern Japanese electric multiple unit train operated by JR West, introduced to provide improved comfort, efficiency, and accessibility on urban commuter services.
-
C.
JR West 201 series EMU
The JR West 201 series EMU is a Japanese electric multiple unit train type operated by West Japan Railway Company, primarily used for commuter services in the Kansai region.
-
D.
JR West 223 series EMU
The JR West 223 series EMU is a Japanese electric multiple unit train used for high-frequency suburban and rapid services in the Kansai region.
-
E.
JR West 225 series EMU
The JR West 225 series EMU is a modern Japanese electric multiple unit train designed for high-speed, high-frequency commuter and suburban services with enhanced safety and passenger comfort features.
- F. None of above. chosen
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
electric multiple unit
ⓘ
rapid transit train ⓘ |
| brakeType |
electro-pneumatic brake
ⓘ
regenerative brake ⓘ |
| carBodyMaterial |
aluminium alloy
ⓘ
stainless steel ⓘ |
| carLength | about 18 m ⓘ |
| controlMethod |
VVVF inverter control
ⓘ
chopper control ⓘ |
| country | Japan ⓘ |
| coupling | Shibata-type coupler ⓘ |
| designedFor |
Osaka Metro network
ⓘ
linked to:
Osaka Metro
high-frequency metro operation ⓘ |
| doorConfiguration | 4 pairs per side per car ⓘ |
| doorOperation | air-operated doors ⓘ |
| doorType | sliding doors ⓘ |
| electricSystem | DC ⓘ |
| enteredService | 1991 ⓘ |
| formation |
4-car sets
ⓘ
6-car sets ⓘ |
| introduced | 1991 ⓘ |
| manufacturer |
Hitachi
ⓘ
Kawasaki Heavy Industries ⓘ Kinki Sharyo ⓘ |
| multipleWorking | compatible with same series only ⓘ |
| operator |
Osaka Metro
ⓘ
Osaka Municipal Transportation Bureau ⓘ
linked to:
Osaka Metro
|
| passengerService | in operation ⓘ |
| powerSupply | 750 V DC third rail ⓘ |
| propulsionType | electric ⓘ |
| railwayLineType | metro line ⓘ |
| railwayOperatorType | subway operator ⓘ |
| region | Osaka Prefecture ⓘ |
| safetySystem |
automatic train control
ⓘ
automatic train stop ⓘ |
| serviceArea |
Osaka metropolitan area
ⓘ
linked to:
Osaka–Kobe metropolitan area
|
| serviceType | all-stations stopping services ⓘ |
| trackGauge | 1,435 mm ⓘ |
| traction | electric traction motors ⓘ |
| transitSystem | Osaka Metro ⓘ |
| usedFor | urban rapid transit ⓘ |
| usedOn | Osaka Metro Tanimachi Line ⓘ |
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: 21-series EMU Description of subject: The 21-series EMU is a type of electric multiple unit train used for urban rapid transit services on Japan’s Osaka Metro network.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.