- Who
- LNER 4-6-2 No. 4468 Mallard
- What
- 201 kilometre(s) per hour
- Where
- United Kingdom (Essendine)
- When
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.
