JINAN -- The Jinan-Qingdao high-speed railway, which was put into operation Wednesday, has introduced 4G service and is preparing for 5G service in the future, according to Jinan's railway sector.

The high-speed railway project has 604 base stations, two tunnels and 11 railway stations, with a total investment of 184 million yuan (about $26.7 million).

The railway's five major stations have also introduced 4G service and prepared for 5G service in the future.

The Jinan-Qingdao high-speed railway is a vital part of China's railway network connecting Qingdao, a major coastal city in East China's Shandong province, with Yinchuan, capital of northwest China's Ningxia Hui autonomous region.