The Field-Marshalls were a range of British farm tractors manufactured by Marshall, Sons amp; Co. of Gainsborough, Lincolnshire from 1945 to 1957. The Field-Marshall were distinctive because of the use of a single-cylinder two-stroke diesel engine (of about 6-litre capacity) coupled to a very large flywheel.
Field-Marshall Series 3 - 1949#208;1953 - 12 mph high and low gearbox
Field-Marshall Series 3A - 1953#208;1957 - 12 mph high and low gearbox