British Rail Class 50
E261993
The British Rail Class 50 is a class of powerful diesel-electric locomotives built in the late 1960s for high-speed passenger services on the British railway network, particularly on the West Coast Main Line.
All labels observed (2)
| Label | Occurrences |
|---|---|
| British Rail Class 50 canonical | 5 |
| BR Class 50 diesel-electric locomotives | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2310141 — 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 50 Context triple: [East Lancashire Railway, hasNotableDieselClass, British Rail Class 50]
-
A.
British Rail Class 37
The British Rail Class 37 is a class of diesel-electric locomotives introduced in the early 1960s, renowned for their distinctive growling engine sound and long service life across the UK rail network.
-
B.
British Rail Class 47
The British Rail Class 47 is a widely used diesel-electric locomotive class introduced in the 1960s, notable for its extensive service across the UK rail network with both passenger and freight trains.
-
C.
British Rail Class 40
The British Rail Class 40 is a class of heavy diesel-electric locomotives built in the late 1950s and early 1960s for express passenger and freight services on British Railways, now preserved and operated on heritage lines.
-
D.
British Rail Class 373
The British Rail Class 373 is a high-speed electric multiple unit train designed for cross-Channel services through the Channel Tunnel, primarily operated by Eurostar between the UK and mainland Europe.
-
E.
British Rail Class 377
The British Rail Class 377 is a fleet of electric multiple-unit commuter trains widely used in southeast England, particularly by Govia Thameslink Railway services.
- 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 50 Target entity description: The British Rail Class 50 is a class of powerful diesel-electric locomotives built in the late 1960s for high-speed passenger services on the British railway network, particularly on the West Coast Main Line.
-
A.
British Rail Class 37
The British Rail Class 37 is a class of diesel-electric locomotives introduced in the early 1960s, renowned for their distinctive growling engine sound and long service life across the UK rail network.
-
B.
British Rail Class 47
The British Rail Class 47 is a widely used diesel-electric locomotive class introduced in the 1960s, notable for its extensive service across the UK rail network with both passenger and freight trains.
-
C.
British Rail Class 40
The British Rail Class 40 is a class of heavy diesel-electric locomotives built in the late 1950s and early 1960s for express passenger and freight services on British Railways, now preserved and operated on heritage lines.
-
D.
British Rail Class 373
The British Rail Class 373 is a high-speed electric multiple unit train designed for cross-Channel services through the Channel Tunnel, primarily operated by Eurostar between the UK and mainland Europe.
-
E.
British Rail Class 377
The British Rail Class 377 is a fleet of electric multiple-unit commuter trains widely used in southeast England, particularly by Govia Thameslink Railway services.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
British Rail locomotive class
ⓘ
diesel-electric locomotive class ⓘ |
| brakeType | air brakes ⓘ |
| buildEnd | 1968 ⓘ |
| builder | English Electric Vulcan Foundry ⓘ |
| buildStart | 1967 ⓘ |
| configuration | dual-cab ⓘ |
| controlType | electro-pneumatic control ⓘ |
| country | United Kingdom ⓘ |
| designedFor |
high-speed passenger services
ⓘ
non-electrified sections of the West Coast Main Line prior to full electrification ⓘ |
| designer | English Electric ⓘ |
| engineType | turbocharged V16 diesel ⓘ |
| fleetNumbers |
50001–50050
ⓘ
D400–D449 ⓘ |
| gauge | standard gauge ⓘ |
| heritageUse | preserved on several UK heritage railways ⓘ |
| introduced | late 1960s ⓘ |
| introducedToService | 1967 ⓘ |
| laterOperator | Network SouthEast ⓘ |
| laterUse | services from London Paddington to the West of England ⓘ |
| lengthOverBuffers | approximately 19.4 m ⓘ |
| livery |
BR large logo blue
ⓘ
Network SouthEast livery ⓘ
linked to:
Network SouthEast
original BR blue and grey ⓘ |
| mainRoute | West Coast Main Line ⓘ |
| manufacturer | English Electric ⓘ |
| multipleWorkingSystem | Blue Star ⓘ |
| nicknamed | Hoovers ⓘ |
| nicknameOrigin | vacuum-cleaner-like sound from the original centrifugal air filters ⓘ |
| numberBuilt | 50 ⓘ |
| operator | British Rail ⓘ |
| powerOutput | approximately 2700 hp ⓘ |
| powerType | diesel-electric ⓘ |
| primeMover |
English Electric 16 CSVT
ⓘ
linked to:
English Electric 16SVT
|
| productionYears | 1967–1968 ⓘ |
| routeAvailability | RA 7 ⓘ |
| topSpeed | 100 mph ⓘ |
| trackGauge | 1435 mm ⓘ |
| trainHeating | electric train heating ⓘ |
| trainProtection | AWS ⓘ |
| transmission | electric ⓘ |
| UICClassification | Co-Co ⓘ |
| usedOn |
London Euston–Glasgow services
ⓘ
West of England main line ⓘ
linked to:
West of England Main Line
|
| weight | approximately 115 tonnes ⓘ |
| wheelArrangement | Co-Co ⓘ |
| withdrawalEnd | early 1990s ⓘ |
| withdrawalStart | late 1980s ⓘ |
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 50 Description of subject: The British Rail Class 50 is a class of powerful diesel-electric locomotives built in the late 1960s for high-speed passenger services on the British railway network, particularly on the West Coast Main Line.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: British Rail Class 50