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从对268号机车、F69PHAC型机车、SD60MAC型机车的研究试验到提出第一批大批量（350台）SD70MAC型交流传动内燃机车的订货（从1994年1月起，每月交货8台），北美走过了很长的发展道路，德国西门予和美国EMD从80年代初开始的合作，在北美获得了第一次大的成功。文中介绍了世界机车的分布状况、三相交流传动技术的发展，提供了许多有价值的试验数据和特性曲线。最新的交流传动内燃机车的水平为：机车牵引功率达2985kW，起动牵引力达780kN，特续牵引力达610kN，运行有效粘着系数达34．5％。
From the research and test of No.268 locomotive, F69PHAC locomotive and SD60MAC locomotive to the order of the first batch of large-capacity (350) SD70MAC AC drive diesel locomotives (from January 1994 onwards, it delivered 8 sets per month) , North America has come a long way. The cooperation between Germany’s Simon and the U.S. EMD since the early 1980s has achieved its first big success in North America. This paper introduces the distribution of the world locomotive, the development of three-phase AC drive technology, provides many valuable test data and characteristic curves. The latest AC diesel locomotives have a traction power of 2985kW, a starting traction of 780kN, a special traction of 610kN and an effective running adhesion coefficient of 34.5%.