LNER Class A4
E651559
The LNER Class A4 is a class of streamlined British express steam locomotives designed by Sir Nigel Gresley, famed for their high-speed service and for producing Mallard, the world speed record holder for steam traction.
All labels observed (5)
| Label | Occurrences |
|---|---|
| LNER Class A4 canonical | 5 |
| LNER Class A4 Bittern | 1 |
| LNER Class A4 Sir Nigel Gresley | 1 |
| LNER Class A4 steam locomotive | 1 |
| LNER Class A4 steam locomotives | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7265594 — 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: LNER Class A4 Context triple: [Mallard, powerClass, LNER Class A4]
-
A.
LNER Class A3
The LNER Class A3 was a famous class of British express steam locomotives, including the record-breaking Flying Scotsman, designed by Sir Nigel Gresley for high-speed mainline passenger service.
-
B.
LNER Class A1
The LNER Class A1 was a series of powerful British express passenger steam locomotives designed by Sir Nigel Gresley for high-speed mainline services in the early 20th century.
-
C.
LNER Class A3 4472 Flying Scotsman
LNER Class A3 4472 Flying Scotsman is a famous British steam locomotive renowned for being one of the world’s most iconic express passenger engines and the first to officially reach 100 mph.
-
D.
LNER Class A4 4468 Mallard
LNER Class A4 4468 Mallard is a famous British steam locomotive best known for holding the world speed record for steam traction, set in 1938.
-
E.
LMS Coronation Class
The LMS Coronation Class was a fleet of powerful British express passenger steam locomotives built for the London, Midland and Scottish Railway in the 1930s, renowned for their streamlined design and high-speed performance.
- 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: LNER Class A4 Target entity description: The LNER Class A4 is a class of streamlined British express steam locomotives designed by Sir Nigel Gresley, famed for their high-speed service and for producing Mallard, the world speed record holder for steam traction.
-
A.
LNER Class A3
The LNER Class A3 was a famous class of British express steam locomotives, including the record-breaking Flying Scotsman, designed by Sir Nigel Gresley for high-speed mainline passenger service.
-
B.
LNER Class A1
The LNER Class A1 was a series of powerful British express passenger steam locomotives designed by Sir Nigel Gresley for high-speed mainline services in the early 20th century.
-
C.
LNER Class A3 4472 Flying Scotsman
LNER Class A3 4472 Flying Scotsman is a famous British steam locomotive renowned for being one of the world’s most iconic express passenger engines and the first to officially reach 100 mph.
-
D.
LNER Class A4 4468 Mallard
LNER Class A4 4468 Mallard is a famous British steam locomotive best known for holding the world speed record for steam traction, set in 1938.
-
E.
LMS Coronation Class
The LMS Coronation Class was a fleet of powerful British express passenger steam locomotives built for the London, Midland and Scottish Railway in the 1930s, renowned for their streamlined design and high-speed performance.
- F. None of above. chosen
Statements (52)
| Predicate | Object |
|---|---|
| instanceOf | steam locomotive class ⓘ |
| boilerPressure | 250 psi ⓘ |
| brakeType | vacuum brake ⓘ |
| builder |
Darlington Works
NERFINISHED
ⓘ
Doncaster Works NERFINISHED ⓘ |
| configuration | 4-6-2 ⓘ |
| countryOfOrigin | United Kingdom ⓘ |
| cylinderArrangement | three-cylinder ⓘ |
| cylinderCount | 3 ⓘ |
| designer | Sir Nigel Gresley NERFINISHED ⓘ |
| designerPosition | Chief Mechanical Engineer of LNER ⓘ |
| driverDiameter | 6 ft 8 in ⓘ |
| fuelType | coal ⓘ |
| gauge | standard gauge ⓘ |
| heritageUse |
mainline railtours
ⓘ
museum exhibits ⓘ |
| holdsRecord | world speed record for steam locomotives ⓘ |
| includes | LNER 4468 Mallard NERFINISHED ⓘ |
| inspiredBy | Bugatti railcar streamlining NERFINISHED ⓘ |
| introduced | 1935 ⓘ |
| lengthOverBuffers | about 71 ft ⓘ |
| maximumDesignSpeed | over 100 mph ⓘ |
| notableFor |
high-speed service
ⓘ
streamlined design ⓘ world steam speed record ⓘ |
| numberBuilt | 35 ⓘ |
| numberPreserved | 6 ⓘ |
| operatedBy | London and North Eastern Railway NERFINISHED ⓘ |
| operatedOn | East Coast Main Line NERFINISHED ⓘ |
| operatorAfterGrouping | British Railways NERFINISHED ⓘ |
| powerType | steam ⓘ |
| preservedExamplesLocatedIn |
Canada
NERFINISHED
ⓘ
United Kingdom NERFINISHED ⓘ United States NERFINISHED ⓘ |
| primaryRoute | London King’s Cross to Edinburgh Waverley ⓘ |
| purpose | express passenger service ⓘ |
| recordDate | 3 July 1938 ⓘ |
| recordedSpeed | 126 mph ⓘ |
| streamliningType | full-length streamlined casing ⓘ |
| subclassOf | LNER Class A4 NERFINISHED ⓘ |
| trackGauge | 1435 mm ⓘ |
| tractiveEffort | about 35,455 lbf ⓘ |
| trainHeating | steam heating ⓘ |
| UICClassification | 2′C1′ h3 ⓘ |
| usedForService |
The Coronation
NERFINISHED
ⓘ
The Elizabethan NERFINISHED ⓘ The Silver Jubilee NERFINISHED ⓘ |
| valveGear |
Gresley conjugated
ⓘ
Walschaerts NERFINISHED ⓘ |
| waterCapacity | tender carried ⓘ |
| wheelArrangement | Pacific ⓘ |
| withdrawalPeriod | 1962–1966 ⓘ |
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: LNER Class A4 Description of subject: The LNER Class A4 is a class of streamlined British express steam locomotives designed by Sir Nigel Gresley, famed for their high-speed service and for producing Mallard, the world speed record holder for steam traction.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
LNER Class A4 steam locomotives
this entity surface form:
LNER Class A4 steam locomotive
this entity surface form:
LNER Class A4 Bittern
this entity surface form:
LNER Class A4 Sir Nigel Gresley