Fastest steam locomotive

According to Official Guinness Records,

The highest speed ever ratified for a steam locomotive is 201 km/h (125 mph), with a brief spell at which the speed reached 126mph, by the London North Eastern Railway 'Class A4' No. 4468 Mallard, which hauled seven coaches weighing 243 tonnes (535,722 lb) down Stoke Bank, near Essendine, between Grantham, Lincolnshire, and Peterborough, Cambridgeshire, UK, on 3 July 1938.

For a complete list of 1938 records, please visit 1938 Guinness Records in United Kingdom.

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