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美国联合太平洋铁路与本国Caterpillar公司的一个子公司Progress Rail Services(PRS)签订了一项对5台改造的SD40-2型内燃机车进行试验的协议。这5台SD40-2型机车是上个世纪70年代制造的,现经过改造换装了功率为2241kW的Cater-pillar3516型低排放柴油机。这些机车将达到美国环保
United Pacific Pacific Rail has entered into an agreement with Progress Rail Services (PRS), a subsidiary of its national Caterpillar Corporation, to test five modified SD40-2 diesel locomotives. These five SD40-2 locomotives were manufactured in the 1970s and are now being retrofitted with Caterpillar-pillar 3516 low-emission diesel engines with a capacity of 2241kW. These locomotives will reach the United States environmental protection