Recently

The Guangzhou-Zhanjiang High-Speed Railway officially began trial operations

The Harbin-Yichun High-Speed Railway completed full track laying

The Ge’er Tunnel on the Xining-Chengdu Railway was successfully completed

……

China’s high-speed railway progress continues to advance

These are all part of

“Eight Vertical and Eight Horizontal” High-Speed RailwayMain Corridors

network

The “Eight Vertical and Eight Horizontal” network weaves

the “vascular system” of China’s high-speed rail lines

China’s high-speed rail network construction has consistently faced

challenges like tunneling through mountains and bridging across waters

Let’s see how these difficult “tough nut” projects

were successfully completed

“Digital Brain”

Xian-Ankang High-Speed Railway crossing the Qinling Mountains

The Xian-Ankang High-Speed Railway construction required crossing the natural barrier of Qinling Mountains

This area has complex geological structures and difficult track transportation

A small mistake could cause project delays

The “Digital Brain” is a smart control platform that can track track-laying equipment

position and status in real-time

enabling complex sections to pass smoothly

Transitioning from rough “mountain-cutting” methods

to millimeter-level precision

“Rainbow in the Sky”

Nantong-Suzhou-Jiaxing-Ningbo High-Speed Railway crossing rivers and sea

Hangzhou Bay has strong tides, complex geology

and high-salt, high-humidity environment

To cross this “hazard-filled” water area

engineers built this “Steel Rainbow”—

the Hangzhou Bay Sea-Crossing Railway Bridge of Nantong-Suzhou-Jiaxing-Ningbo High-Speed Railway

Designed with 39 segments, with 450-meter spans between adjacent piers

It’s the world’s largest span ballastless track cable-stayed bridge under construction

Real-time Monitoring, Precision Blasting

Chengdu-Chongqing Middle Line High-Speed Railway protecting ecology

The Chengdu-Chongqing Middle Line High-Speed Railway crosses Sichuan and Chongqing

passing through multiple water source protection areas

Xuantian Lake, home to swans, is one of them

The construction team equipped with new environmental monitoring systems

monitoring water quality, noise and other indicators in real-time

Through reduced steel pipe pile usage, controlled blasting and other technologies

limiting environmental impact within specified ranges

Neither disturbing the swans’ habitat nor compromising high-speed rail construction

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Qinling Mountains

The Qinling Mountains are a major east-west mountain range in central China that have served as a natural geographical boundary between northern and southern China for centuries. Historically, they were crucial for protecting the ancient capitals of the Qin and Han dynasties and are home to the famous Taoist site, Mount Hua. Today, the range is a critical biodiversity hotspot, most notably serving as the last refuge of the wild giant panda.

Hangzhou Bay Sea-Crossing Railway Bridge

The Hangzhou Bay Sea-Crossing Railway Bridge is a major cable-stayed bridge in Zhejiang Province, China, which opened in 2013. It was constructed to significantly shorten the travel time between Shanghai and Ningbo, spanning 22.3 miles (36 kilometers) across Hangzhou Bay. At the time of its completion, it was one of the longest sea-crossing bridges in the world.

Xuantian Lake

I am unable to find any verifiable historical or cultural information about a place named “Xuantian Lake.” It is possible the name may be misspelled, refer to a very local or lesser-known site, or be a fictional location. For an accurate summary, please verify the correct name or provide additional context.