By utilizing the difference between curve s arc and chord,a series of more convenient and easily rememberable calculating formulas for railway curves are derived.

• 本文利用曲线的弧弦差推导出一系列比较简便、易记的铁路曲线计算公式,不需三角函数表及各种铁路曲线表,仅以简单的运算即可求得常用的各种曲线要素。