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A timber lorry or log truck is a large truck used to carry logs. Some have integrated flatbeds, some are discrete tractor units, and some are configured to spread a load between the tractor unit and a dollied trailer pulled behind it. Often more than one trailer is attached. == History == The most convenient trees to cut down were those near waterways for easy transportation.〔(【引用サイトリンク】title=A History of Timber: Logging Trucks and Early Timber Transportation )〕 As the supply dwindled and loggers had to go further from water, they used teams of oxen or horses for hauling.〔 These were superseded by steam-powered donkeys and locomotives.〔 The final development was the logging truck.〔 A truck was used for logging in Covington, Washington, in 1913.〔(【引用サイトリンク】title=The Washington Log Trucking Industry: Costs and Safety Analysis )〕 The coming of World War I and the resulting demand for the Pacific Northwest's Sitka spruce for airplanes "established log trucking in Washington".〔 The United States Army assigned thousands of men to the Spruce Production Division to build roads into western Washington to harvest the dispersed stands of the best trees.〔 After the war ended, a plenitude of surplus military trucks made their adoption attractive to logging companies, particularly smaller outfits that could not afford expensive locomotives.〔(【引用サイトリンク】title=Log Truck Stirs Dust through Clearcut )〕 The primitive trucks were improved in the 1920s and 1930s, with more powerful engines and better braking systems.〔 The old "narrow, solid rubber—sometimes steel—treadless tires" were replaced by wider pneumatic ones with treads.〔 Plank roads gave way to graded dirt ones.〔 By the mid-1930s, trucks were hauling as much timber out of the Pacific Northwest as the railroads.〔 World War II saw improved truck designs, and once again these were passed along to logging companies through the sale of surplus military vehicles after the war was over.〔 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「Logging truck」の詳細全文を読む スポンサード リンク
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