The diversity of modern agriculture requires many tractor designs. Historically, utility (use) has been the basis of tractor classification schemes. Based on utility, there are six categories of tractors: general purpose, row crop, orchard, vineyard, industrial, and garden. The designers of modern tractors have attempted to produce tractors with the broadest possible uses, but these categories are still applicable if a sub-category is added for each type of propulsion system: rear wheel drive (RWD), four wheel drive articulating steering (4WDAS), four wheel drive four wheel steer (4WD), tracks (T), and rear wheel drive with front wheel assist (FWA).
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