Earlier Marshall Tractor Line
The first single-cylinder Marshall tractor to be introduced was the Marshall 15/30 in 1930. It had a bore of 8 inches with a 10-inch stroke and the maximum r.p.m. was 550.
In 1932 the 15/30 was upgraded to become the Marshall 18/30. This model featured the same bore and stroke dimensions but the maximum r.p.m. was increased and the tractor's transmission was modified heavily.
The next single-cylinder Marshall to be introduced was the Marshall 12/20 in 1935. This tractor was of a completely new design, with a 6-inch bore and a 9-inch stroke. There were many smaller modifications such as a redesigned injection pump and cylinder head. In 1938 the 12/20 model was redesigned and the model coding was changed so that the new model became the Marshall Model "M" tractor. During the war tractor production was reduced greatly due to Marshall's factory capacity being engaged on war work. However after the war, in 1945, Marshall's of Gainsborough Introduced the improved tractor they had developed as the "Field-Marshall"
Read more about this topic: Field Marshall
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