Initially after the war there was little demand for new tractor as there was no money to buy them and rationing was still in place with price controls. But as time progressed demand increased, and some machines were re engined by enterprising farmers and blacksmiths with surplus diesel engines from surplus trucks. Following the war as demand increased, development of the tractor was stepped up as bigger engines and more sophisticated hydraulics were developed. Farm implements can be attached to the rear of the tractor by either a drawbar or a three-point hitch. The three-point hitch was invented by Harry Ferguson and has been standard on agricultural tractors since the early 1960s. Equipment attached to the three-point hitch can be raised or lowered hydraulically with a control lever. The equipment attached to the three-point hitch is usually completely supported by the tractor. Another way to attach an implement is via a Quick Hitch, which is attached to the three-point hitch. This enables a single person to attach an implement quicker and put the person in less danger when attaching the implement as it can be done from the cab.