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美国铁路虽然有许多3000kW(4000hp)及一些3730kW(5000hp)的内燃机车,但主型机车仍是2237kW(3000hp)的6轴内燃机车,目前有大约1万台这种机车在干线铁路上使用。这些2237kW机车的平均服役时间已达到20～25年。 为了替换这些功率较小的机车,美国两大内燃机车制造厂商——GE公司和GM公司的电动机车部(EMD)近年来致力于开发4474kW(6000hp)的大功率内燃机车。GE开发的叫作AC6000,EMD开发的称SD90MAC。两种机车都采用三相交流传动。 采用4474kW大功率机车有许多好处,例如1
Although there are many 3000kW (4000hp) and some 3730kW (5000hp) diesel locomotives on the U.S.A., the main locomotive is still a 2,237kW (3000hp) six-axle diesel locomotive and there are currently about 10,000 such locomotives used on trunk railways. The average service time of these 2237kW locomotives has reached 20 to 25 years. In an effort to replace these less powerful locomotives, the two major diesel locomotive manufacturers, GE and GM, have been focusing their efforts on the development of 4474kW (6000hp) high-power diesel locomotives in recent years. Called the AC6000, developed by GE, the SD90MAC was developed by EMD. Both locomotives use three-phase AC drive. There are many benefits to using a 4474 kW high-powered locomotive, such as 1