These tractors typically articulate because they cannot turn with driven front wheels. 4-wheel drive tractors were also developed to allow more power to the tractor. Front wheel assist tractors are able to better use traction to pull tillage equipment through the field. The progression into the modern era led to additional developments in size and horsepower. Next was the development of the PTO, or the power take-off, which alowed implements towed by the tractor to be powered by the tractor instead of a drive wheel. The three-point hitch was invented, which allowed impliments to be attached to the tractor directly. The first tractors were simple machines, used either to power stationary farm implements, such as a thresher, but eventually grew into the workhorses seen today. They eventually evolved to traction engines used to plow. Tractors are farming vehicles that began as steam powered engines to run a stationary farm machine.
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