Railway vehicle roll-over under strong cross-wind action is significant problem considered in the context of vehicle aerodynamics. Train accidents induced by wind occurring in last two decades resulted in safety procedures concerning this phenomenon included in specifications or standards. Assessment of railway vehicle aerodynamic stability is conducted on the basis of roll-over critical velocity, hence velocity causing vehicle overturning. All of the methods concerning this topic suggest to calculate roll-over critical velocity from equilibrium equation, where aerodynamic characteristics of the vehicle are taken into account in the form of aerodynamic coefficients. These coefficients can be mainly obtained from measurements on aerodynamic balance or assessed for specific train. This paper presents different method to define stability of rail vehicles under strong cross-wind action. Presented tests results show that roll-over critical velocity can be obtained directly from wind tunnel model tests. This method seems to be appropriate, more accurate and simpler than indirect determination of the roll-over critical velocity using aerodynamic coefficients by following the common procedures referring to cross-wind assessment of railways.

在强大的侧风作用下，铁路车辆的侧翻是在车辆空气动力学的背景下考虑的重大问题。在过去的二十年中，由于风引起的火车事故导致规范或标准中涉及此现象的安全程序。铁路车辆空气动力学稳定性的评估是基于侧翻临界速度进行的，因此，速度会导致车辆倾覆。与该主题相关的所有方法均建议根据平衡方程计算侧翻临界速度，在该方程中，以空气动力学系数的形式考虑了车辆的空气动力学特性。这些系数主要可以从空气动力学平衡测量中获得或针对特定列车进行评估。本文提出了在强侧风作用下定义轨道车辆稳定性的不同方法。提出的测试结果表明，可以从风洞模型测试中直接获得翻滚临界速度。这种方法似乎比使用空气动力学系数间接确定侧翻临界速度的方法更合适，更准确，更简单，方法是遵循参考跨风评估铁路的通用程序，利用空气动力学系数进行间接确定。