In view of the provisions for superelevation and transition curve length related to subway and conventional national railway, it is reasonable and necessary to increase the maximum track superelevation to 150 mm for operation at 120 km/h with corresponding transition curve length obtained from analysis and calculation, which serves as supplements to the current “Code for Metro Design”( GB50157—2013 ) at the design speed of 120 km/h with respect to superelevation and transition curve length.%针对我国地铁、国铁曲线超高值和缓和曲线长度的规定，综合分析运行速度120 km/h条件下，轨道最大超高值提高到150 mm的合理性和必要性，同时也对相应的线路缓和曲线长度进行分析计算，给出计算值和建议值。对我国现行《地铁设计规范》(GB50157—2013)关于设计速度120 km/h条件下线路的超高和缓和曲线长度取值进行必要的补充说明。
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