In this paper the railway track is considered as a double elastic system of both rails and sleepers and the vibration is described in detail with two partial differential equations.
本文将铁路轨道看作由钢轨和轨枕组成的双层弹性系统，用两个偏微分方程联立描述其振动。
2
The lower structure in the coupling system is railway track where rails are considered as beams with finite length rested on double layer continuous elastic foundation.
下部结构为轨道，钢轨被离散为双层弹性基础上有限长度的梁。
3
The track, transmission system and the structure of double guns gas cutting machine are introduced. The measures of reconstruct and design features are put forward.