一、前言铁路作为国家重要的基础设施,是国民经济的大动脉和大众化的交通工具,在经济社会发展中的作用日益突出。随着“十二五”计划的展开,铁路装备 I. Preface As an important national infrastructure, the railway is the main artery of the national economy and a popular means of transport. Its role in economic and social development has become increasingly prominent. With the “Twelve-Five ” plan unfolded, railway equipment