ADDED SECOND RAILWAY LINE
analog-digital line converter
Beijing-Baotou railway line
Beijing-Jiulong Railway line
Beijing-Kowloon Railway Line
Beijing-Shanghai railway line
Beijing-Tianjin intercity railway line
Canton-Shenzhen railway line
Chengdu-Dujiangyan railway line
coal pillar under railway line
crossing over railway line
Datong-Qinhuangdao railway line
dedicated high-speed passerger railway line
dedicated passenger railway line
Dedicated Passenger Traffic Railway Line