Zhu said some trains on the Bejing-Zhangjiakou line are "smart" as they provide 5G signals and wireless charging for passengers, as well as intelligent lighting.
朱说北京到张家口线上的一些火车很“智能”。车上有 5G 信号覆盖，为乘客提供无线充电以及智能照明。
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The opening of the Beijing-Zhangjiakou high speed railway took place in December, 2019. The railway is a milestone in China's railway development because it has used the latest technologies in railway building.