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From the line engineering, including bridges, tunnels and ballastless track, to the traction power supply and train operation control system, and to the development of high-speed trains, China's high-speed railway has taken a unique innovative path, which has enabled China to take the lead in the world in this field. From having nothing to building a complete and mature technical system, this process has been both difficult and grand. When China entered the high-speed railway era, high-speed railway not only built a new living space for people, but also provided high-quality public products for society, and became a powerful driving force for economic and social development.