British Rail Class 321 electric multiple units
E646613
The British Rail Class 321 electric multiple units are a series of suburban and commuter trains introduced in the late 1980s for use on electrified routes in the UK, known for their widespread service in the south-east of England and East Anglia.
All labels observed (3)
| Label | Occurrences |
|---|---|
| British Rail Class 321 electric multiple units canonical | 1 |
| British Rail Mark 3 based EMU | 1 |
| British Rail Second Generation EMU | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6350301 — 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: British Rail Class 321 electric multiple units Context triple: [British Rail Engineering Limited, notableWork, British Rail Class 321 electric multiple units]
-
A.
British Rail Class 318 electric multiple units
The British Rail Class 318 electric multiple units are suburban EMU trains introduced in the mid-1980s for commuter services around Glasgow, Scotland, featuring steel-bodied construction and 25 kV AC overhead electrification.
-
B.
British Rail Class 319 electric multiple units
The British Rail Class 319 electric multiple units are dual-voltage commuter trains introduced in the late 1980s for cross-London services, capable of operating on both overhead and third-rail electrification systems.
-
C.
British Rail Class 317 electric multiple units
The British Rail Class 317 electric multiple units are a series of suburban electric trains introduced in the early 1980s for commuter services around London, known for their steel-bodied Mark 3–derived design and long service life.
-
D.
British Rail Class 323
The British Rail Class 323 is a type of electric multiple unit train widely used on suburban and commuter rail services in the West Midlands and North West England.
-
E.
British Rail Class 325
The British Rail Class 325 is an electric multiple unit train type designed specifically for high-speed postal and parcel services on the UK rail network.
- 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: British Rail Class 321 electric multiple units Target entity description: The British Rail Class 321 electric multiple units are a series of suburban and commuter trains introduced in the late 1980s for use on electrified routes in the UK, known for their widespread service in the south-east of England and East Anglia.
-
A.
British Rail Class 318 electric multiple units
The British Rail Class 318 electric multiple units are suburban EMU trains introduced in the mid-1980s for commuter services around Glasgow, Scotland, featuring steel-bodied construction and 25 kV AC overhead electrification.
-
B.
British Rail Class 319 electric multiple units
The British Rail Class 319 electric multiple units are dual-voltage commuter trains introduced in the late 1980s for cross-London services, capable of operating on both overhead and third-rail electrification systems.
-
C.
British Rail Class 317 electric multiple units
The British Rail Class 317 electric multiple units are a series of suburban electric trains introduced in the early 1980s for commuter services around London, known for their steel-bodied Mark 3–derived design and long service life.
-
D.
British Rail Class 323
The British Rail Class 323 is a type of electric multiple unit train widely used on suburban and commuter rail services in the West Midlands and North West England.
-
E.
British Rail Class 325
The British Rail Class 325 is an electric multiple unit train type designed specifically for high-speed postal and parcel services on the UK rail network.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
British Rail multiple unit class
ⓘ
electric multiple unit ⓘ |
| basedOn |
British Rail Mark 3 coach design
ⓘ
linked to:
British Rail Mark 3 coaching stock
|
| brakingSystem | air brakes ⓘ |
| builtFor | Network SouthEast ⓘ |
| carBodyMaterial | steel ⓘ |
| couplingType | Tightlock ⓘ |
| designedBy | British Rail Engineering Limited ⓘ |
| designedFor |
commuter services
ⓘ
suburban services ⓘ |
| doorType |
power-operated sliding doors (refurbished)
ⓘ
slam doors (original) ⓘ |
| electrificationSystem | 25 kV AC overhead ⓘ |
| enteredService |
1988
ⓘ
1989 ⓘ |
| family |
Mark 3-based EMU
ⓘ
linked to:
Class 321 EMU
|
| formation | 4-car unit ⓘ |
| hasSubclass |
Class 321/3
ⓘ
Class 321/4 ⓘ Class 321/9 ⓘ |
| introduced |
1988
ⓘ
late 1980s ⓘ |
| manufacturer | BREL York ⓘ |
| multipleWorking |
compatible with Class 317
ⓘ
compatible with Class 455 (limited) ⓘ |
| operator |
Greater Anglia
ⓘ
London Midland ⓘ Network SouthEast ⓘ ScotRail (briefly) ⓘ
linked to:
ScotRail
Silverlink ⓘ
linked to:
Silverlink Metro
c2c ⓘ |
| operatorCountry | United Kingdom ⓘ |
| powerType | electric ⓘ |
| primaryRegionOfOperation |
East Anglia
ⓘ
South East England ⓘ |
| refurbishmentProgram | Renatus refurbishment (Greater Anglia) ⓘ |
| status |
being withdrawn
ⓘ
in service (reduced numbers) ⓘ |
| topSpeed |
100 mph
ⓘ
161 km/h ⓘ |
| trackGauge | standard gauge ⓘ |
| usedOn |
Great Eastern Main Line
ⓘ
West Coast Main Line commuter services ⓘ
linked to:
West Coast Main Line
services from London Euston ⓘ services from London Liverpool Street ⓘ services in Cambridgeshire ⓘ services in Essex ⓘ services in Hertfordshire ⓘ services in Norfolk ⓘ services in Suffolk ⓘ |
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: British Rail Class 321 electric multiple units Description of subject: The British Rail Class 321 electric multiple units are a series of suburban and commuter trains introduced in the late 1980s for use on electrified routes in the UK, known for their widespread service in the south-east of England and East Anglia.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
Class 321
linked to: British Rail Class 321 electric multiple units
linked to: British Rail Class 321 electric multiple units