Beijing subway Line 4 北京地铁4号线
Considering the signaling system project for Beijing subway Line 4 and its extension, two different implementation options are discussed.
针对北京地铁4号线及其延伸，讨论线路延伸工程中信号系统适用的两种实施方案。
Taking the Xuanwumen Station work in Beijing metro line 4 as example which is beneath and pass through existing subway station its general situations are introduced.
以北京地铁四号线宣武门车站下穿既有地铁车站工程为例，介绍了其具体工程概况，提出了相应的设计方案。
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