One is the adoption of the fixed operating value in the whole speed range, for it causes the results that the operation is too sensitive when the speed is high, so that the sanding is too frequent;
二是采用先撤砂后减流的控制方法，这种预先长时间的大量撤砂，必然造成轮轨的加速磨耗。
One is the adoption of the fixed operating value in the whole speed range, for it causes the results that the operation is too sensitive when the speed is high, so that the sanding is too frequent;
二是采用先撤砂后减流的控制方法，这种预先长时间的大量撤砂，必然造成轮轨的加速磨耗。
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