The unmistakeable Field Marshall series have become some of the most desirable and expensive of all collectable tractors. Their massive single-cylinder diesel engines might have been outclassed by the multi-cylinder competition in the fifties, but there’s no denying the Marshall’s character and strength. Built to last with no-nonsense engineering, and with a surprising reserve of power and torque, the Field Marshall also found favour as a crawler tractor, and this month Andrew Pollock meets the lucky owner of both styles.