The principle and logic program of railwayspecialline computer interlocking system made of PLC are introduced in the paper, the safty of the system is also analyzed.
介绍由PLC构成的铁路专用线车站联锁系统的原理和逻辑编程步骤，并分析了系统的安全性。
2
They will also be building new roads and a specialrailwayline.
他们还将修筑一些新的道路和一条铁路专线。
3
They will also be building new roads and a specialrailway-line.