The Allis-Chalmers ED 40 tractor was the last model made by the UK subsidiary of the American Allis-Chalmers Corporation before the plant at , was closed in 1985. Introduced at the Smithfield Show, London in 1960, it retained all the features that required but in a manner that made it a universal farm tractor. Only diesel power was available from a four-cylinder ohv of 137.89 cu.ins. indirect injection engine made by the Standard Motor Co, Coventry (the same engine as used in the earlier Coventry built Massey Ferguson 35 tractors). As the name may imply, the tractor had about 40 horsepower.