speed increasing gear train 增速齿轮副 ; 增速齿轮系
With the increasing of the speed of train, high reliability of the contact system is required.
随着列车运行速度的提高，对接触网系统可靠性的要求也越来越高。
When the increasing of the speed and loading of the freight train, the heat load of the wheel will certainly increase, the life of the rail wheel may be influenced terribly.
随着车辆的重载化和高速化，车轮的热负荷进一步增加，对车轮的疲劳寿命带来重大影响。
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