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架线式电机车牵引重车组沿坡道向上运行时,车组重量通常受牵引电动机的温升,车组制动条件和机车与钢轨间粘着条件的限制。但按温升条件求车组允许定额重量的常用公式在这里就不适用了。因为该公式的推导是在下列基础上进行的,即认为电机车在坡道上牵引重车组和牵引空车组所做的功是相等的,
When the overhead traveling tractor unit runs along the ramp, the weight of the train unit is usually limited by the temperature rise of the traction motor, braking conditions of the train set and the conditions of adhesion between the locomotive and the rail. However, according to the temperature rise conditions for vehicles to allow the quota weight of the formula used here is not applicable. Because the derivation of this formula is based on the assumption that the work done by an electric locomotive on the ramp for towing a heavy truck and for pulling an empty train is equal,