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:''This article refers to the steam-powered agricultural tractor; for other types of steam tractor, see: Traction engine A steam tractor is a vehicle powered by a steam engine which is used for pulling. In North America, the term ''steam tractor'' usually refers to a type of agricultural tractor powered by a steam engine, used extensively in the late 19th and early 20th centuries. In Great Britain, the term ''steam tractor'' is more usually applied to the smallest models of traction engine - typically those weighing seven tons or less - used for hauling small loads on public roads. Although known as ''light steam tractors'', these engines are generally just smaller versions of the 'road locomotive'. This article concentrates on the steam-powered agricultural vehicles intended for the direct-pulling of ploughs and other implements (as opposed to cable-hauling). ==Development (Great Britain)== Owing to differences in soil conditions, the development of steam-powered agricultural machines differed considerably on either side of the Atlantic. In Great Britain, a number of traction engine builders attempted to produce a design of agricultural engine that could pull a plough directly, in place of a team of horses. However, the heavier and wetter soils found in Britain meant that these designs were not successful — being less economical to use than the team of horses they were intended to replace. These engines were also known as "steam tractors". Instead, farmers resorted to cable-hauled ploughing using ploughing engines. A distinctive example of a British-designed (agricultural) steam tractor is the Garrett ''Suffolk Punch'', a 1917 design intended to compete directly with internal combustion-powered alternatives. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Steam tractor」の詳細全文を読む スポンサード リンク
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