The Sentinel Steam Wagon was originally produced in Glasgow by Alley & MacLellan in the latter quarter of the 1800s. Just prior to the First World War they moved production to Shrewsbury and, in 1920, became the Sentinel Wagon Works where production continued until the late 1930s. Up until this time the Sentinel was the haulage vehicle of its day and was capable of a respectable 60 m.p.h. In 1933 new legislation that imposed weight penalties on goods vehicles proved fatal for steam wagons as higher freight charges forced sales down in favour of diesels. Despite this they managed to produce a new vehicle, the 4 cylinder S type, which met these tough regulations. Although ultimately succeeded by their own diesel range, they still produced steam wagons for the Argentine Government until as late as 1950. Sentinel Wagon Works were eventually taken over by Roll Royce in 1957.