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China's fast passenger tracks network consists of four parts: express rail-way with speeds between 300km/h and 350 km/h, passenger rail lines with speeds between 200 km/h and 250 km/h, intercity high-speed railways that run at 200 km/h and lines benefiting from the sixth railway acceleration in April 2007. Within the passenger tracks network, high-speed trains designed to travel between 300 km/h and 350 km/h can also travel on tracks made for speeds between 200 km/h and 250 km/h and vice versa, according to industry experts. This compatibility is designed to maximize the efficiency and profits of the railway lines.