JR East 209 series
E1031415
The JR East 209 series is a Japanese commuter electric multiple unit train type introduced in the 1990s for high-frequency urban and suburban services in the Tokyo area.
All labels observed (2)
| Label | Occurrences |
|---|---|
| JR East 209 series canonical | 1 |
| JR East 209-500 series EMU | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T12977871 — 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: JR East 209 series Context triple: [Keiyō Line, rollingStockUsed, JR East 209 series]
-
A.
JR East 205 series
The JR East 205 series is a Japanese electric multiple unit commuter train type introduced in the 1980s and widely used on various urban and suburban lines in the Tokyo area.
-
B.
JR West 221 series
The JR West 221 series is a Japanese electric multiple unit train type operated by West Japan Railway Company for suburban and interurban passenger services.
-
C.
JR West 207 series
The JR West 207 series is a Japanese electric multiple unit commuter train operated by West Japan Railway Company on urban and suburban lines 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 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.
- 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: JR East 209 series Target entity description: The JR East 209 series is a Japanese commuter electric multiple unit train type introduced in the 1990s for high-frequency urban and suburban services in the Tokyo area.
-
A.
JR East 205 series
The JR East 205 series is a Japanese electric multiple unit commuter train type introduced in the 1980s and widely used on various urban and suburban lines in the Tokyo area.
-
B.
JR West 221 series
The JR West 221 series is a Japanese electric multiple unit train type operated by West Japan Railway Company for suburban and interurban passenger services.
-
C.
JR West 207 series
The JR West 207 series is a Japanese electric multiple unit commuter train operated by West Japan Railway Company on urban and suburban lines 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 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.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
Japanese train type
ⓘ
commuter train ⓘ electric multiple unit ⓘ |
| brakeType |
electro-pneumatic brakes
ⓘ
regenerative braking ⓘ |
| carBodyMaterial | stainless steel ⓘ |
| configuration | various 4-, 6-, 8-, and 10-car sets ⓘ |
| countryOfOrigin | Japan ⓘ |
| designedBy | JR East NERFINISHED ⓘ |
| designedFor |
high-frequency services
ⓘ
one-man operation capability on some lines ⓘ suburban services ⓘ urban services ⓘ |
| doorConfiguration | 4 pairs per side per car (typical commuter layout) ⓘ |
| electrificationSystem | 1,500 V DC overhead ⓘ |
| family | 209 series family ⓘ |
| introduced | 1990s ⓘ |
| manufacturer | JR East (own workshops and contractors) ⓘ |
| multipleWorking | with other 209 series variants ⓘ |
| notableFeature |
energy-saving equipment
ⓘ
lightweight design ⓘ |
| operator |
East Japan Railway Company
ⓘ
JR East NERFINISHED ⓘ Tokyo area commuter lines ⓘ |
| operatorType | commuter rail ⓘ |
| powerType | electric ⓘ |
| predecessor |
103 series
NERFINISHED
ⓘ
201 series NERFINISHED ⓘ |
| primaryAreaOfOperation | Tokyo area NERFINISHED ⓘ |
| purpose | cost-reduced mass-production commuter EMU ⓘ |
| region | Kantō region ⓘ |
| serviceEntry | 1993 ⓘ |
| serviceType |
all-stations stopping services
ⓘ
rapid services ⓘ |
| successor |
E231 series
NERFINISHED
ⓘ
E233 series NERFINISHED ⓘ |
| trackGauge | 1,067 mm ⓘ |
| usedOn |
Chūō–Sōbu Line
NERFINISHED
ⓘ
Hachikō Line NERFINISHED ⓘ Joban Line NERFINISHED ⓘ Kawagoe Line NERFINISHED ⓘ Keihin-Tōhoku Line NERFINISHED ⓘ Keiyō Line NERFINISHED ⓘ Musashino Line NERFINISHED ⓘ Nambu Line NERFINISHED ⓘ Negishi Line NERFINISHED ⓘ Sotobō Line NERFINISHED ⓘ Sōbu Line (Rapid) NERFINISHED ⓘ Uchibō Line NERFINISHED ⓘ |
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: JR East 209 series Description of subject: The JR East 209 series is a Japanese commuter electric multiple unit train type introduced in the 1990s for high-frequency urban and suburban services in the Tokyo area.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
JR East 209-500 series EMU