The Institution of Mechanical Engineers presented its coveted Heritage Engineering Award to Mallard in recognition of its designer's engineering genius.
John Wood from the Institution told ITV News why he believes the locomotive is so special.
Mallard, the world's fastest steam locomotive, has received an award on the anniversary of designer Sir Nigel Gresley's death.
Gresley's grandson, Tim Godfrey, was born the same year as Mallard broke the world speed steam record. He attended the ceremony in York.