夹直线 meaning in Chinese

tangential path

Among railway line ' s plane design parameter , the minimum radius of curve , transition curve ' s type and length , straight line between two curves , centre - to - centre distance of track are key factors which confine railway to bringing up speed , moreover these factors among maglev railway request even more strict
由于高速磁悬浮铁路采用了非接触式的行车技术，舒适性将得到很好的改善。铁路线路平面设计参数中，最小曲线半径、缓和曲线长度、夹直线长度、线间距离是限制列车速度的关键因素，高速磁浮铁路同样如此。