高手帮忙论文摘要关键词翻译！（用软件直译的请勿回答）

The stop positioning device of freight vehicle was mainly designed through of examining the railroad freight yard worksite and consulting the information, simultaneously contact the actual of logistics in the railroad freight yard, then designing the mechanical system and pneumatic system in the stop positioning device of freight vehicle. In order to improve the logistics efficiency and reduce logistics costs, we must ensure that the freight vehicle stop down quickly. At the same time, for avoiding the downslide strength caused by the wind and the slope of the railway, to ensure the safety of loading and unloading cargo. The design was investigative researched by examining the railroad freight yard worksite, combined with mechanical engineering, mechanical principles, mechanical design, pressure transmission, transport logistics and other school-related knowledge to complete. The purpose to stop the train steady and improve logistics efficiency was reached. Thereupon mechanical desi