在北京铁路局管内电气化铁路各线，接有众多的地方铁路专用线。为保证牵引供电及其安全运营， 本文介绍设置接口设备的几种方某，并根据应用实例，阐述了几种方案的具体内容，优缺点及其投资概况，以供参考及进一歩探讨.

There are a lot of local railway special lines connected with the electrified railways in the region of the Beijing Railway Administration. In order to guarantee the traction power supply and the safety operation,the paper introduces several schemes of the installation of the connecting equipments. Based on practical examples,several schemes of connecting equipments,especially several kinds of the open-close substations, are expounded. The advantages and disadvantages and their investments are introduced. They are valuable for reference and for further discussion.