It is known that Foshan-Guangzhou-Dongguan intercity railway is being optimized and will be extended to Shenzhen by adjusting the line direction of Changping-Longhua intercity railway, which to develop a central rail in the GBA, that is Guangzhou-Shenzhen central intercity railway. When the two intercity railways are connected, an intercity rail will be formed to quickly connect the the four cities' downtown areas and the Guangzhou-Shenzhen science and technology innovation corridor, which will significantly shorten the transportation time in an hour.