This paper presents a method for the optimisation of wheel–rail profiles, and this is based on the relationships between the equivalent conicity, RRD curve and rail profile slope. This method can be used to improve the riding stability of trains when rolling across turnouts, and to optimise the equivalent conicity. The measured profile of a straight switch rail, i.e. a 60D40 rail laid in a high-speed turnout switch area, was taken as a sample for optimisation. The existing curve of equivalent conicity was lowered for reverse-reasoning calculation of the optimised profile. The optimised profile of the 60D40 rail was taken as the optimal design for an in-service straight switch rail. The effectiveness of the optimised design was then evaluated based on static wheel–rail contact and vehicle-turnout coupling dynamics. The conclusions show that, for an in-service straight switch rail, profile optimisation can effectively improve the wheel–rail relationship, thus enhancing the riding stability of trains in turnout switch areas.

本文提出了一种优化轮轨轮廓的方法，该方法基于等效锥度、RRD曲线和钢轨轮廓坡度之间的关系。该方法可用于提高列车穿越道岔时的行驶稳定性，优化等效锥度。以直道岔轨道（即高速道岔区域铺设的60D40钢轨）的实测剖面作为优化样本。降低现有等效锥度曲线，进行优化剖面的逆推理计算。60D40轨道的优化轮廓被作为在役直道岔轨道的优化设计。然后基于静态轮轨接触和车辆道岔耦合动力学评估优化设计的有效性。结论表明，