Track-laying begins on Shanghai-Nanjing section of new railway

"Previously, using traditional single-line track-laying equipment, a single crew could lay around 4 kilometers per day," Song said.

"Now, with the dual-line system, a single crew can complete 9 kilometers per day, while significantly reducing process steps and labor intensity."

To coordinate complex, concurrent operations, teams are using cloud-based tracking and transit management systems. These platforms monitor equipment around the clock, providing real-time dispatching and early warnings to maintain safety and keep the project on schedule.

Construction crews are also leveraging green and smart technologies, including high-power electric rail vehicles, energy-storage mobile welding units, robotic bolt fasteners and eco-friendly rail cutters.

"The robot can secure two bolts every five seconds, improving efficiency by two-thirds compared to manual labor and maintaining consistent performance," said Ou Jinping, director of the materials and equipment department of the project from the China Railway First Group.

Advanced stress-release systems, intelligent rail collision machines and high-precision inspection carts are being used to ensure the track meets strict safety and smoothness standards.

Underground works including roadbeds, bridges and tunnels have been largely completed, while station buildings and electrical systems are progressing on schedule.

Once operational, the high-speed line will ease heavy passenger traffic along the Yangtze River corridor, and help divert Shanghai-bound transit off existing coastal and Beijing-Shanghai routes.