铁路线路术语，指由机务、车辆、工务、电务、供电等段专用并由其管理的线路。如机务段的机车准备线、机车转头用的三角线、转盘线、卸油线；车辆段内车辆检修作业用的线路和工务、电务、供电段内停留轨道车、作业车及其他车辆用的线路。岔线、段管线与正线，到发线接轨时，均应铺设安全线。
当阀门处于开启状态时，整个阀门就像管线上的一段管道一样。
When the valve is open, it is like a straight piece of pipe in the line.
下面的插图显示了通信管线及其段。
The following illustration shows the communication pipeline and its segments.
就中开线春亭段输气管线在检修维护中发现的内层管道截面非正常变形问题进行了分析研究。
An analysis of abnormal deformation, which was found in the inner pipeline cross-section during the maintenance, was made on the Zhong-Kai gas transportation pipeline.
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