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Why doesn't Zhan-Guang high-speed railway speed limit 300?

The track of high-speed railway has smoothness, and the track foundation is supported by offline engineering. Guangzhou-Zhanjiang high-speed railway is located in Guangdong province, with a total length of 400 kilometers and a design speed of 350 kilometers per hour. The line starts from Guangzhou Station and ends at Zhanjiang North Station, passing through Foshan, Zhaoqing, Yunfu, Yangjiang, Maoming and other cities. High-speed railway, referred to as high-speed railway for short, refers to a railway system with high design standards and high speed for the safe running of trains.