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介绍了1992年末由美国铁路协会主持在伯灵顿北方铁路的一条运煤干线上进行交流传动机车（EMD的SD60MAC）和直流传动机车（EMD的SD40和SD60）牵引力和制动力试验的比较。试验结果表明，交流传动机车较之直流传动机车具有高得多的牵引力和大得多的制动力。尽管交流传动机车在牵引和制动时产生的纵向轨道力比直流机车的稍高些，但对线路及列车运行并没有太大的影响。测量结果还表明，交流传动机车比直流机车具有低得多的横向轨道力，这主要归功于其管队能的径向转向架。
Describes a comparison of traction and braking force tests conducted on AC coal lines (EMD’s SD60MAC) and DC locomotives (EMD’s SD40 and SD60) hosted by the American Railway Association at the Northern Burlington Railway in late 1992. The test results show that the AC locomotive has much higher traction and a much greater braking force than the DC locomotive. Although the AC locomotive traction and braking produce longitudinal track force slightly higher than the DC locomotive, but the line and train operation and not much impact. The measurements also show that AC locomotives have much lower lateral orbital forces than DC locomotives, largely due to the radial bogies their fleet can power.