How Gresley's A4 Pacifics became the World's Fastest Steam Engines

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Often regarded as among the most famous steam locomotives in the world, the Gresley Class A4 Pacifics of the LNER married exceptional art-deco styling with simple but sturdy underpinnings to create a perfect blend of form and function, presenting unmatched performance that allowed one of their kind, 4468 Mallard, to take home the record for world's fastest steam locomotive - an accolade it continues to maintain to this day.

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References:
- LNER Info (and their respective sources)
- Wikipedia (and its respective references)