It is reported that starting from July 28, many parts of the country have been hit by continuous high-temperature and sunny weather. The surface temperature in some areas has exceeded 60℃, and the railway tracks are facing safety risks such as thermal expansion and deformation, and rail gap shrinkage. The railway department has urgently activated the highest-level high-temperature emergency plan, organizing more than 1,200 maintenance workers and over 300 professional equipment to carry out a "nighttime railway track maintenance campaign" along the Beijing-Shanghai-Shenzhen high-speed railway lines.

Trains from 0:00 to 4:00 every day are out of service. During the "window period", the railway tracks are brightly lit in the night. Maintenance workers, wearing reflective vests and carrying tools such as infrared thermometers and torque wrenches, measure the temperature of the rails section by section, focusing on checking weak links such as expansion joints of continuous welded rails and curved sections. To address the hidden danger of rail expansion and derailment easily caused by high temperatures, the staff first use hydraulic track jacks to lift the rails, then calibrate the rail direction with laser collimators, and use tamping machines to compact the ballast, ensuring that the rail gauge error is controlled within 2 millimeters. At the same time, "physical cooling" is applied to the rails by spraying special cooling agents and loosening rail fasteners. As of August 5, 328 kilometers of rails have been maintained under high temperatures, and 156 hidden dangers such as rail surface scratches and loose fasteners have been handled, ensuring the smooth operation of trains in high-temperature weather.