既有线
existing tunnel
the Existing Subway
existing-railway
existing line
existing Metro line
existing railway lines
existing railway
existing track line
exiting railway
existing
existing railway line
existing lines
existing subway
the Existing Railway Line
existing railways
operated line
既有线测量
survey of existing line；survey of existing railway
survey of existing railway
existing railway surveys
survey of existing line
既有线车辆
vehicles on existing line
既有线复测
Repetition survey of existing railway
既有线提速
existing double railway speed-up
existing-railway speed-raising
increasing train speed on the existing lines
Speed-increase of existing railway
Existing line speed-up
existing railway
speed increase of existing lines
speed-up of existing line
speed raising on existing line
既有线站场测量
survey of existing station yard
临近既有线
Adjacent to Existing Line
铁路既有线
Existing railway curve line
existing railways
下穿既有线
Going underneath Existing Railway
有线线路分配器
LTC:Londline Trunk Coutroller