4D Show Duration: 04:20 Format: 3D HD Audio: 5.1 On the 3rd July 1938, at 4:22 pm, the A4 Pacific steam locomotive, Mallard, swept through Grantham on the East Coast mainline towards Kings Cross. By the time it pulled into Peterborough 26 minutes later the train had reached 126mph – a new world record, which...