Steam locomotive and tender, No 4468 �Mallard�, Class A4 Pacific, 4-6-2, designed by Nigel Gresley for LNER, built at Doncaster in 1938; length over buffers: 71' 3/8"; width: 9'; weight: 102 tons; 19 cwt; (total weight 165 tonnes 7 cwt); area 50.3m square. Driving wheel diameter 6 feet, 8 inches.