It ought to be a film, of course, pitched somewhere between The Right Stuff and Chariots of Fire. Meanwhile, Don Hales well-ordered, compelling book will do nicely Andrew Martin, Daily Express Seventy years ago, on 3 July 1938, on the East Coast main line, the streamlined A4 Pacific locomotive Mallard reached a top speed of 126mph - a world record for steam locomotives which still stands. Since th...