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Key bridge on Xi'an-Chongqing high-speed railway completes structural closure

Key bridge on Xi'an-Chongqing high-speed railway completes structural closure

Built World

Miaojialiang bridge closure advances the 739-km rail link that will cut Xi'an-Chongqing travel to 2.5 hours

Today: Miaojialiang grand bridge closes

Overview

Updated 1 hour ago

Workers poured the final concrete on the Miaojialiang grand bridge in Chongqing's Chengkou County on October 12. The 941.6-meter structure, with its tallest pier reaching 103.5 meters, is a key link on the Xi'an-Chongqing high-speed railway.

The 739-kilometer line will cut travel between Xi'an and Chongqing from about six hours to 2.5 hours. It will connect with the Chengdu-Chongqing, Zhengzhou-Chongqing, and Kunming-Chongqing high-speed railways, expanding China's western rail network.

Why it matters

When complete, the line cuts Xi'an-Chongqing travel from 6 hours to 2.5 hours, linking northwest and southwest China's rail networks.

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Key Indicators

739 km
Total railway length
Full Xi'an-Chongqing high-speed railway, split into Xi'an-Ankang and Ankang-Chongqing sections.
941.6 m
Miaojialiang bridge length
The bridge spans 6 continuous beam sections across 15 spans in mountainous terrain.
103.5 m
Highest pier height
The tallest pier equals a 30-story building, requiring specialized climbing formwork.
66
Tunnels completed on Kangyu section
The Ankang-Chongqing section has completed 66 of its tunnels as of October 2026.

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People Involved

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Timeline

May 2023 October 2026

4 events Latest: Today
Tap a bar to jump to that date
  1. Miaojialiang grand bridge closes

    Today Construction

    Final concrete pour completes the 941.6-meter bridge's continuous beam, a key link on the Kangyu section.

  2. Gaosheng No. 2 tunnel completes, 7,234 meters

    Construction

    The high-risk tunnel in Chongqing's Kaizhou district finishes, marking a key milestone for the Kangyu section.

  3. Xi'an-Ankang section of Xi'an-Chongqing HSR opens

    Milestone

    The first segment of the railway opens to traffic, carrying passengers between Xi'an and Ankang.

  4. Pile foundation construction begins on Miaojialiang bridge

    Construction

    China Railway 12th Bureau starts pile foundation work on the bridge in Chengkou County, Chongqing.

Scenarios

1

Kangyu section opens in 2028, full line operational

Likely Resolves by End of 2028

Discussed by: Chinese state media (Xinhua, Chongqing Daily) expressing confidence in the construction timeline

Track laying, station construction, and electrical work proceed on schedule through 2027. Testing and commissioning begin in late 2027 or early 2028. The full Xi'an-Chongqing line enters commercial operation in 2028, cutting travel time to 2.5 hours.

2

Kangyu section opening delayed to 2029 or later

Possible Resolves by End of 2029

Discussed by: A risk scenario; no named source currently predicts this outcome

Complex mountain geology, tunnel challenges, or testing setbacks push the full line opening to 2029 or later. The Kangyu section's 478 km crosses difficult terrain with high-risk tunnels and tall bridges, leaving room for schedule slippage.

3

Kangyu section opens in phases

Possible Resolves by End of 2028

Discussed by: Pattern established by the Xi'an-Ankang section, which opened before the Kangyu section

Some segments of the Kangyu section open before others, similar to how the Xi'an-Ankang section opened in September 2026 ahead of the full line. The Fanhui-Kaizhou-Wanzhou connection line could open separately, or the eastern portion near Chongqing could open first.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

September 2026

Shituo Yangtze River Bridge main span closure (2026)

The road section of the Shituo Yangtze River Bridge, a key project on the Chongqing-Wanzhou high-speed railway, closed its main span on September 26. The 1,416.9-meter bridge in Chongqing's Fuling District features a 253-meter-tall pylon and a 608-meter main span.

Then

The bridge is expected to set four world records, including the world's tallest dual-linked pylon for a combined road-and-rail bridge.

Now

It will support 350 km/h trains on the Chongqing-Wanzhou line, part of China's eight vertical and eight horizontal high-speed rail network.

Why this matters now

Shows the scale of bridge engineering on Chongqing's high-speed rail projects, with the Miaojialiang bridge facing similar challenges of height and span in mountain terrain.

June 2011

Beijing-Shanghai High-Speed Railway (2011)

China's flagship high-speed rail line opened in 2011, connecting Beijing and Shanghai over 1,318 kilometers. It cut travel time from about 10 hours to under 5 hours.

Then

The line became the world's busiest high-speed rail route and demonstrated the transformative impact of HSR on travel patterns.

Now

It set the template for China's nationwide high-speed rail expansion, which now exceeds 40,000 kilometers of track.

Why this matters now

Provides a benchmark for what the Xi'an-Chongqing line will achieve: a dramatic reduction in travel time that reshapes regional connectivity between northwest and southwest China.

Sources

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