Hornby R1282 “MALLARD RECORD BREAKER” Train Set. rd July 1938 the LNER A4 Locomotive “MALLARD” set the World Speed record for a Steam Engine at 126 mph at Stoke Bank, south of Grantham. This Mallard Record Breaker Train Set includes the famous locomotive, as well as two BR Gresley Composite Coaches, and a BR Gresley Brake Coach.