On the morning of the 27th, with the first train of Jinan Rail Transit Line 4 entering the station smoothly, the first domestic subway crossing the Quanyu Karst Zone was officially opened to traffic. “The biggest difficulty in building a subway in Quancheng is to ensure a harmonious coexistence between the subway and spring water.” Hu Bingbing, vice director of the technical management department of the Jinan Rail Transit Group Planning and Technology Center, said that Line 4 is the first subway in Jinan close to the “world's first spring” Baotu Spring Group, and the closest point to Baotu Spring is only 1.4 kilometers away.

On the morning of the 27th, with the first train of Jinan Rail Transit Line 4 entering the station smoothly, the first domestic subway crossing the Quanyu Karst Zone was officially opened to traffic. “The biggest difficulty in building a subway in Quancheng is to ensure a harmonious coexistence between the subway and spring water.” Hu Bingbing, vice director of the technical management department of the Jinan Rail Transit Group Planning and Technology Center, said that Line 4 is the first subway in Jinan close to the “world's first spring” Baotu Spring Group, and the closest point to Baotu Spring is only 1.4 kilometers away.