轨道交通线路运营单位应当保持上述器材和设备的完好。
The CRC line operating unit shall keep the above-mentioned equipment and installation in a good state.
而原来的规划，北京的轨道交通线路只有13条，总长408公里。
And the original planning of the rail lines in Beijing only 13 of 408 km.
我国第一条城市高架轨道交通线路-明珠线已在上海建成并投入运行。
The first urban viaduct rail transit, the Mingzhu Line, has been constructed and put into operation in Shanghai, China.
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