In addition to the discontinuity of the rail profile of a normal turnout, the unique S-shaped curve of a crossover significantly affects the negotiation performance of a train. For heavy-haul freight trains, the in-train forces generated during the braking process may further deteriorate the running safety. Investigating the dynamic behaviour of the train passing through the crossover under braking forces, therefore, can provide a reasonable basis for ensuring train safety. This paper analyses the dynamic response and wheel wear of a three-vehicle train negotiating a single crossover under variable conditions, including variable braking forces, wheel-rail friction coefficient, and crossover layout forms. The results show that the three factors have considerable influences on train safety. If one of the three factors keeps an ideal level, the safe probability of empty wagons can be significantly improved. Considering that there are still some crossovers with tight curves in the existing railway system, avoiding large braking or lubricating the wheel flange in the crossover is still an effective solution to improve the vehicle's performance. In addition, for a new single crossover, a 600-m-radius curve is a good option for balancing permissible train speeds and construction costs of the crossover.

除了正常道岔的钢轨轮廓不连续外，立交桥独特的S形曲线显着影响列车的通过性能。对于重载货运列车，制动过程中产生的车内力可能会进一步恶化行车安全。因此，研究列车在制动力下通过立交桥的动态行为，可为保障列车安全提供合理依据。本文分析了在可变制动力、轮轨摩擦系数和交叉布局形式等可变条件下，通过单次交叉的三辆列车的动态响应和车轮磨损。结果表明，这三个因素对列车安全有相当大的影响。如果三个因素之一保持理想水平，可以显着提高空车安全概率。考虑到现有铁路系统中仍有部分弯道较紧的跨界车，在跨界车中避免大刹车或润滑轮缘仍是提高车辆性能的有效解决方案。此外，对于新的单节交叉路口，600 米半径的曲线是平衡允许的列车速度和交叉路口的建设成本的一个很好的选择。