Just over 80years ago on the East Coast main line, the streamlined A4 Pacific locomotive Mallard reached a top speed of 126mph--a world record for steam locomotives that still stands. Since then, millions have seen this famous locomotive, resplendent in her blue livery, on display at the National Railway Museum in York. Here, Don Hale tells the full story of how the record was broken: from the 19th-century London-Scotland speed race and, surprisingly,...