Why is there a train sound in Jincheng Zidong International?

There are many railway lines around Zidong International. There are many railway lines around Zidong International, including Jincheng to Jiaozuo, Houma to Jiyuan, and the planned Jincheng to Luoyang express railway. Among them, the distance from Zidong International of Zhengzhou-Taiyuan high-speed railway to Baima Temple Mountain Tunnel is less than 5 kilometers, and the sound of the train can be heard.