目前,在美国电力传动内燃机车上,采用一种可测定车钩对列车作用的重要装置,即本务机车用的牵引电动机负荷安培计。若机车组中所有的机车都是相同型号的并都处于牵引工况,那末该安培计可以表示机车组的牵引力。然而,总的车钩牵引力取决于机车组的牵引电 At present, in the United States electric drive diesel locomotive, an important device that can measure the effect of the coupler on the train is the traction motor load ammeter used by the locomotive. If all locomotives in the locomotive group are of the same model and are in towing conditions, then the ammeter can represent the locomotive group’s traction. However, the overall coupler traction depends on the locomotive group’s traction