Loco speedometers and track-destroying trains

Mallard on the Great Hall Turntable

Mallard still holds the world steam speed record at 126mph. Although fitted with a speed recorder in the cab a dynamometer car was needed to provide the accuracy for the record. Next year marks the 75th anniversaray of Mallard’s unbroken record. To celebrate the NRM will bring together all 6 surviving A4s for the first time having shipped two members of the class to Britain from North America.

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