The Mallard holds the speed record for steamlocomotives at 124.5 MPH. She was restored to mainline condition for the 50th Anniversary of her record breaking run in 1988, but the boiler certificate has since expired. Due to the expense of keeping her in running condition and the popularity of her as an exhibit at York, she will be kept in a static condition for the foreseeable future.
|Diameter driving wheels||2032 mm|
|Weight full||105 ton|
|Overheated area||70 m2|
|Grate area||4 m2|
|Cilinders||3: 470x660 mm|
|Remarks||The A4 class was developed as a high-speed engine, based on the A3 class. It was intended for the high speed service between London and Newcastle.|
|1938||Build for||London and North Eastern Railway||A4||Mallard/ 4468|
|1946||Renumbered by||London and North Eastern Railway||A4||Mallard/ 22|
|1948||Take over by||British Railways||A4||Mallard/ 60022|
|1963||Take over by||National Railway Museum York||A4||Mallard/ 4468|
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