能源和交通是我国国民经济高速发展的重要保证条件,二者都是社会主义现代化建设的战略重点,重载运输是铁路发展的必然趋势。近一、二十年来,苏、美等国铁路部门为了适应煤炭运输需要,大力发展重载运输,用载重量大的货车编组成长而重的列 Energy and transportation are the important guarantee conditions for the rapid development of the national economy in our country. Both of them are the strategic priorities for the socialist modernization drive. Heavy-haul transport is an inevitable trend of railway development. In the past one or two decades, the railway departments of the Soviet Union, the United States and other countries, in order to meet the needs of coal transportation, vigorously developed heavy-haul transportation and organized long and heavy haul trucks with heavy loads