牵引动力改革是铁路现代化重要的一环。正确地选择牵引动力,既可经济合理地利用能源,加速现代化的进程,又可有效地增强运输能力,提高运输效率,降低运输成本,获取更大的技术经济效果。早在1956年,根据对国际上牵引动力发展趋势和经验的研究,我国铁路十二年科技发展规划中就提出了“技术政策的中心环节是牵引 Traction power reform is an important part of railway modernization. Correct choice of traction power can not only make economic and rational use of energy, speed up the process of modernization, but also effectively enhance transport capacity, increase transportation efficiency, reduce transportation costs and achieve greater technical and economic results. As far back as 1956, according to the research on the development trend and experience of international traction power, in the 12-year plan for the development of science and technology of China’s railways, it proposed that "the central link in the technical policy is traction