Class 321
E553404
Class 321 is a type of British electric multiple unit train widely used for suburban and commuter rail services in the UK.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Class 321 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5834943 — 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: Class 321 Context triple: [London Midland, fleetIncluded, Class 321]
-
A.
Class 323
Class 323 is a type of British electric multiple unit train widely used for suburban and commuter rail services in the UK.
-
B.
Class 319
Class 319 is a type of British dual-voltage electric multiple unit train used primarily for commuter and regional services.
-
C.
Third Class, Second Grade
Third Class, Second Grade is a specific rank within the historical Chinese Order of the Double Dragon, denoting a particular level of honor and distinction among its graded classes.
-
D.
Classe
Classe is a historic coastal area near Ravenna in Italy, renowned for its early Christian monuments and archaeological remains.
-
E.
Y class
Y class is the standard economy fare class used by airlines, typically representing full-fare economy tickets with the least restrictions on changes and refunds.
- 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: Class 321 Target entity description: Class 321 is a type of British electric multiple unit train widely used for suburban and commuter rail services in the UK.
-
A.
Class 323
Class 323 is a type of British electric multiple unit train widely used for suburban and commuter rail services in the UK.
-
B.
Class 319
Class 319 is a type of British dual-voltage electric multiple unit train used primarily for commuter and regional services.
-
C.
Third Class, Second Grade
Third Class, Second Grade is a specific rank within the historical Chinese Order of the Double Dragon, denoting a particular level of honor and distinction among its graded classes.
-
D.
Classe
Classe is a historic coastal area near Ravenna in Italy, renowned for its early Christian monuments and archaeological remains.
-
E.
Y class
Y class is the standard economy fare class used by airlines, typically representing full-fare economy tickets with the least restrictions on changes and refunds.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
electric multiple unit
ⓘ
passenger train ⓘ |
| brakeType | air brakes ⓘ |
| builtFor | 25 kV AC overhead electrified routes ⓘ |
| carBodyConstruction | steel ⓘ |
| collectionMethod | pantograph ⓘ |
| country | United Kingdom ⓘ |
| coupling | Tightlock ⓘ |
| designation |
Class 321/3
ⓘ
Class 321/4 ⓘ Class 321/9 ⓘ |
| designedFor |
commuter services
ⓘ
suburban services ⓘ |
| doorArrangement | 2+2 seating in standard class (typical) ⓘ |
| doorType |
power-operated sliding doors after refurbishment
ⓘ
slam doors originally ⓘ |
| electricSystem | 25 kV AC overhead ⓘ |
| enteredServiceAs | Networker family precursor ⓘ |
| family | British Rail Second Generation EMU ⓘ |
| formation | 4-car sets ⓘ |
| gauge | standard gauge ⓘ |
| introduced | late 1980s ⓘ |
| laterOperator |
Abellio Greater Anglia
ⓘ
linked to:
Greater Anglia
Arriva Rail North ⓘ Greater Anglia ⓘ London Midland ⓘ Northern Rail ⓘ ScotRail (briefly) ⓘ
linked to:
ScotRail
Silverlink ⓘ
linked to:
Silverlink Metro
c2c (for a period) ⓘ
linked to:
c2c
|
| manufacturer |
BREL York
ⓘ
British Rail Engineering Limited ⓘ |
| multipleWorking |
compatible with Class 317
ⓘ
compatible with Class 455 (limited) ⓘ |
| operatorCountry | United Kingdom ⓘ |
| originalOperator | Network SouthEast ⓘ |
| powerType | electric ⓘ |
| refurbishmentProgram | Renatus upgrade (selected units) ⓘ |
| serviceEntry | 1988 ⓘ |
| serviceType |
commuter rail
ⓘ
suburban rail ⓘ |
| topSpeed |
100 mph
ⓘ
161 km/h ⓘ |
| trackGauge | 1435 mm ⓘ |
| UICClassification | Bo′Bo′+2′2′+2′2′+Bo′Bo′ (typical) ⓘ |
| usedAs | outer suburban EMU ⓘ |
| usedOn |
Great Eastern Main Line
ⓘ
Midland Main Line commuter services ⓘ West Coast Main Line outer suburban services ⓘ |
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: Class 321 Description of subject: Class 321 is a type of British electric multiple unit train widely used for suburban and commuter rail services in the UK.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.