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在1992年中期，首批北美铁路交流重载牵引机车在伯灵顿北方铁路（BN）投入商业运行。这4台SD60MAC试生产型机车是由GM公司的EMD与德国西门子公司合作开发和制造的。列车牵引试验记录结果表明：这些六轴电传动内燃机车的起动牵引力达780kN，即起动粘着系数达45％，持续工况下的牵引力达610kN，即持续工况下的粘着系数达35％，从而开创了机车粘着的一个“新时代”。截至1993年初，已经证明：这些粘着水平在重载牵引中能够被充分利用，在北美严酷的冬季气候条件下，交流传动机车具有卓越的可靠性。另一个明显的事实是：径向可调转向架、交流牵引电动机和每一台转向架配装一台逆变器的结构形式不仅能产生迄今所见的最高粘着水平，同时可降低车轮磨耗。伯灵顿北方铁路已订购了350台SD70MAC机车，并从1993年底开始陆续交付。在经过最初一段时间的对运用和维修人员的新技术培训之后，SD70MAC机车正式投入重载煤炭列车运营。由于采用了更强功能的计算机，并在SD60MAC机车在北美铁路上5个月的试运行的基础上对控制系统进行了进一步改进，从而使SD70MAC机车显示了更高的全天候粘着水平。到1994年8月，已有70多台SD70MAC机车交付使用。初期的运用经验证明，SD70MAC型机车完全达到了预期的性能和可靠性。
In mid-1992, the first North American railroad interchange heavy-duty traction locomotive was put into commercial operation at the Burlington North Railway (BN). The four SD60MAC pilot production locomotives are developed and manufactured by GM EMD in cooperation with Siemens AG of Germany. Train traction test results show that: These six-axis electric diesel locomotive traction starting up to 780kN, that is, the starting adhesion coefficient of 45%, the traction under continuous conditions of 610kN, that is, under continuous operating conditions, the adhesion coefficient of 35%, thus Create a locomotive adhesion of a “new era.” As of early 1993, it has been demonstrated that these levels of adhesion can be fully utilized in heavy-duty traction, with excellent reliability of AC drives in North America’s harsh winter climates. Another obvious fact is that the radial adjustable bogies, AC traction motors and the configuration of an inverter per bogie not only produce the highest adhesion levels seen so far, but also reduce wheel wear. Burlington Northern Railways has ordered 350 SD70MAC locomotives and has been delivering them since the end of 1993. After the initial period of new technical training on the use and maintenance of personnel, the SD70MAC locomotive was officially put into operation for heavy-haul coal trains. The control system has been further improved with the introduction of a more powerful computer and with a five-month trial run of the SD60MAC locomotive on the North American Railway, resulting in a much higher all-weather level of adhesion for the SD70MAC locomotive. As of August 1994, more than 70 SD70MAC locomotives have been delivered. Initial experience shows that, SD70MAC locomotive fully achieved the expected performance and reliability.