Workers install the power supply, communication, information and signaling systems on a section of the Qingdao-Rongcheng intercity railway in Laixi City, east China's Shandong Province, July 31, 2020. (Photos: Xinhua)

Staff members test the signaling system on a section of the Qingdao-Rongcheng intercity railway in Laixi City, east China's Shandong Province, July 31, 2020.

A worker installs the power supply, communication, information and signaling systems on a section of the Qingdao-Rongcheng intercity railway in Laixi City, east China's Shandong Province, July 31, 2020.

Workers install the power supply, communication, information and signaling systems on a section of the Qingdao-Rongcheng intercity railway in Laixi City, east China's Shandong Province, July 31, 2020.

Staff members test the signaling system on a section of the Qingdao-Rongcheng intercity railway in Laixi City, east China's Shandong Province, July 31, 2020.

Workers install the power supply, communication, information and signaling systems on a section of the Qingdao-Rongcheng intercity railway in Laixi City, east China's Shandong Province, July 31, 2020.

A staff member tests the signaling system on a section of the Qingdao-Rongcheng intercity railway in Laixi City, east China's Shandong Province, July 31, 2020.