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The railway line 【小题1】(connect) Beijing and Zhangjiakou, the co-host city of the Beijing 2022 Winter Olympics, is the world's first intelligent, high-speed railway. It 【小题2】(go)into operation on Dec 30, 2019. The railway is 174 km long, with a maximum design speed of 350 kph. It reduces the travel time between Beijing and Zhangjiakou from over three hours to 47 minutes. The train is designed with an area to store snowboards, a device to secure wheelchairs and a mobile news center 【小题3】 passengers can watch live Olympic broadcasts.