LMS Coronation Class locomotive No. 6220 Coronation set the disputed 114 mph British steam speed record in 1937.
The run took place on 29 June 1937 during a press trip connected with the new Coronation Scot service. Just south of Crewe, the streamlined locomotive reached a reported 114 mph while hauling an invited train. The speed narrowly surpassed the previous British steam record held by an LNER A4 locomotive.
The run was dramatic because the train entered crossover points at Crewe while travelling too fast for the braking distance available. The locomotive and coaches remained on the rails, although crockery in the dining car was reportedly smashed. The record stood until LNER A4 No. 4468 Mallard reached 126 mph in 1938.
No. 6220 was the first locomotive of the Coronation Class and carried the class name. The class was designed by William Stanier for powerful express services between London Euston and Glasgow Central. Duchess of Gloucester, City of Glasgow and Queen Mary were other locomotive names, but none is the answer to this particular record question.