BR Class A4
E651560
BR Class A4 is a class of streamlined British steam locomotives designed by Sir Nigel Gresley, best known for including the Mallard, the world speed record holder for steam traction.
All labels observed (1)
| Label | Occurrences |
|---|---|
| BR Class A4 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7265595 — 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: BR Class A4 Context triple: [Mallard, powerClass, BR Class A4]
-
A.
B&O No. 4500
B&O No. 4500 is a historic Baltimore & Ohio Railroad steam locomotive preserved for its significance in early 20th-century American railroading.
-
B.
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.
-
C.
LMS 8F Class
The LMS 8F Class is a British heavy freight steam locomotive type widely used by the London, Midland and Scottish Railway and later by British Railways, particularly during World War II.
-
D.
BR Standard Class 5
The BR Standard Class 5 was a versatile British steam locomotive class introduced in the 1950s for mixed-traffic duties across the nationalised railway network.
-
E.
Class 57 diesel locomotive
The Class 57 diesel locomotive is a British mainline locomotive type, rebuilt from older Class 47s, widely used for both passenger and freight services including prestigious sleeper and charter trains.
- 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: BR Class A4 Target entity description: BR Class A4 is a class of streamlined British steam locomotives designed by Sir Nigel Gresley, best known for including the Mallard, the world speed record holder for steam traction.
-
A.
B&O No. 4500
B&O No. 4500 is a historic Baltimore & Ohio Railroad steam locomotive preserved for its significance in early 20th-century American railroading.
-
B.
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.
-
C.
LMS 8F Class
The LMS 8F Class is a British heavy freight steam locomotive type widely used by the London, Midland and Scottish Railway and later by British Railways, particularly during World War II.
-
D.
BR Standard Class 5
The BR Standard Class 5 was a versatile British steam locomotive class introduced in the 1950s for mixed-traffic duties across the nationalised railway network.
-
E.
Class 57 diesel locomotive
The Class 57 diesel locomotive is a British mainline locomotive type, rebuilt from older Class 47s, widely used for both passenger and freight services including prestigious sleeper and charter trains.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
British steam locomotive class
ⓘ
class of steam locomotive ⓘ |
| achievedSpeed | 126 mph ⓘ |
| alsoKnownAs | LNER Class A4 NERFINISHED ⓘ |
| brakeType | vacuum brake ⓘ |
| builder |
Doncaster Works
NERFINISHED
ⓘ
London and North Eastern Railway NERFINISHED ⓘ |
| configuration |
4-6-2
ⓘ
Pacific ⓘ |
| countryOfOrigin | United Kingdom ⓘ |
| cylinderCount | 3 ⓘ |
| designedBy | Sir Nigel Gresley NERFINISHED ⓘ |
| designedFor | high-speed express passenger services ⓘ |
| designer | Sir Nigel Gresley NERFINISHED ⓘ |
| era | steam era ⓘ |
| fittedWith | streamlined casing ⓘ |
| fuelType | coal ⓘ |
| gauge | standard gauge ⓘ |
| introduced | 1935 ⓘ |
| memberOf | BR Class A4 NERFINISHED ⓘ |
| notableMember |
Bittern
ⓘ
Dominion of Canada NERFINISHED ⓘ Dwight D. Eisenhower NERFINISHED ⓘ Mallard ⓘ Sir Nigel Gresley NERFINISHED ⓘ Union of South Africa NERFINISHED ⓘ |
| notedFor |
high speed performance
ⓘ
streamlined design ⓘ |
| numberPreserved | 6 ⓘ |
| operatedBy |
British Railways
NERFINISHED
ⓘ
London and North Eastern Railway NERFINISHED ⓘ |
| operator |
British Railways Eastern Region
NERFINISHED
ⓘ
London and North Eastern Railway NERFINISHED ⓘ |
| powerType | steam ⓘ |
| predecessor | LNER Class A3 NERFINISHED ⓘ |
| preservedIn |
Canada
NERFINISHED
ⓘ
United Kingdom NERFINISHED ⓘ United States NERFINISHED ⓘ |
| primaryRole | express passenger locomotive ⓘ |
| railwayCompany | London and North Eastern Railway NERFINISHED ⓘ |
| recordDate | 1938-07-03 ⓘ |
| retiredFromService | 1960s ⓘ |
| successor | BR Standard Class 7 NERFINISHED ⓘ |
| totalProduced | 35 ⓘ |
| trackGauge | 1,435 mm ⓘ |
| UICClassification | 2′C1′ h3 ⓘ |
| usedOn | East Coast Main Line NERFINISHED ⓘ |
| wheelArrangement | 4-6-2 ⓘ |
| worldRecord | fastest steam locomotive ⓘ |
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: BR Class A4 Description of subject: BR Class A4 is a class of streamlined British steam locomotives designed by Sir Nigel Gresley, best known for including the Mallard, the world speed record holder for steam traction.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.