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The national railway network is the backbone of the railway line.
As the main line in a certain area.
Communication of the main lines of the liaison line and the hub line.
The railway line within or between cities that is basically not connected to trunk railways or urban rail transit lines and is built, operated by or with the participation of China railways.
The railway line built and operated by the local authorities within a city or between adjacent cities that does not run through or basically does not run through the main line railway.