研究目的: 土耳其东西铁路干线拟按 180 ～250 km/h 速度目标值、客货共线混跑铁路标准建设，而目前国内尚无时速 200 km 以上的客运共线铁路标准，本文重点研究时速 250 km 客货共线铁路不同曲线半径条件下平面缓和曲线长度的合理取值。
研究结论: (1)250 km/h 客货共线铁路的缓和曲线长度要综合考虑未被平衡的横向加速度时变率和超高时变率;(2)在曲线半径一定时，速度越高，则超高越大;高速列车行车速度一定时，设计超高值是决定缓和曲线长度的主要因素;(3)250 km/h 客货共线铁路要同时兼顾高、低速列车的安全性和舒适度，设计超高值较时速 250 km 的客运专线小，缓和曲线长度较短。
Research purposes: The transmeridional railway lines in turkey intends to 180 ～ 250 km / h target speed， mixed passenger and freight traffic ，while there is not the standard of mixed passenger and freight traffic above 200 km/h in china ，the paper focuses on the transition curve length of the railway line for mixed passenger and freight traffic with speed of 250 km / h．
Research conclusions:(1) The transition curve length of the railway line for mixed passenger and freight traffic with speed of 250 km / h need consider the unbalanced rate of lateral acceleration slope and rate of superelevation slope． (2) When the radius of curve is certain ，the superelevation is greater with the higher speed; when the speed of the high － speed train traffic is certain ，the value of the design superelevation is the main factor which determines transition curve length． (3)The mixed passenger and freight traffic with speed of 250 km / h need consider the comfort and the safety of the high － speed train and the low － speed train， the value of design superelevation is smaller than the passenger dedicated line ， and the transition curve length is shorter．
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