The Mallard at Speed, by Roy Wilson.

Britain’s first streamlined steam locomotives were Sir Nigel Gresley’s A4 Class, introduced by the LNER in 1935 to establish new standards in high speed running on the East Coast Main Line. On July 3, 1938, soon after its completion, The Mallard, a later member of the class, established a new world speed record for steam traction of 126mph which still stands to this day. Although the streamlined shapes of the A4s and their LMS rivals resulted from wind tunnel testing, this illustration demonstrates that there can be more than one solution to the same problem.