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美国联合铁路已获得向GM公司EMD订购的28台5000英制马力（3729kw）SD80MAC型交流传动内燃机车中的首批机车的交货。这些交流传动机车是目前该铁路用于货运的功率最大的机车，其装用EMD与联合铁路共同开发的隔振式WhisPerCab司机室。两台这种具有高粘着力和改善了燃油经济性的机
U.S. Joint Railway has received the delivery of the first locomotives of 28 5,000 hp (3729 kW) SD80 MAC AC drive diesel locomotives ordered to GM’s EMD. These AC drive locomotives are the most powerful locomotives currently used for freight transportation by the railway. They are equipped with a vibration isolation WhisPerCab cab jointly developed by EMD and Union Railways. Two such machines with high adhesion and improved fuel economy