Hale's book, Mallard - How the Blue Streak broke the World Speed Record, was first released in paperback by Aurum Press in May 2008 to coincide with the 70th anniversary of the speed record for steam locomotives held by LNER Class A4 4468 Mallard.
Kylchap exhausts are found on many French and British locomotives notably the Flying Scotsman and the world record holding Mallard.
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On 3 July 1938, Essendine saw the London and North Eastern Railway Class A4 locomotive number 4468 "Mallard" break the land speed record for a steam locomotive reaching 126mph, which is still unbroken to this day.
Sir Nigel Gresley of the LNER became a proponent when he incorporated double Kylchap exhausts into four of his A4 Pacifics, including the world speed record holder Mallard.