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.

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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