ROGER FIBREOPTICAL NETWORK DOSSIERS Build a Fiber Brief
HOME / Progress of the Chengdu-Kunming Railway Second Line Bridge Construction

Progress of the Chengdu-Kunming Railway Second Line Bridge Construction

Fiber and communications infrastructure knowledge brief Published 01 Jan 2024

Prepared for preliminary research by the ROGER FIBRE knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

The Chengdu-Kunming Railway second line has achieved major bridge construction milestones, including the completion of the Mianshan Double Track Bridge and the Panzhihua Jinsha River Bridge, overcoming complex terrain and technical challenges.

Key Bridge Construction Milestones

Mianshan Double Track Bridge: On May 11, 2026, the Mianshan Double Track Bridge, designed by China Railway Second Institute and constructed by China Railway 21st Bureau Group, successfully completed a full bridge installation with a 10,000-ton continuous beam spanning the existing line through a swivel mechanism, marking a significant engineering achievement in the expansion project. Panzhihua Jinsha River Bridge: This bridge features a 208-meter main span, making it the largest prestressed-concrete low-tower cable-stayed bridge in China. It is the first in the country to adopt upper cable beam anchor block technology, and it incorporates China's largest tonnage hyperboloid spherical bearing along with a shear tenon vibration isolation system, ensuring stability and resilience in a challenging seismic and geological environment.

Engineering Challenges

The railway passes through extremely rugged terrain, including mountains, rivers, and fault zones. Key challenges included: Constructing tunnels through complex strata, such as the 12. 4 km Yakou Tunnel crossing six sets of strata and seven regional faults, and the 12.

76 km Ranjiawan Tunnel through the fragile Xigeda stratum. Building bridges over large rivers and reservoirs, including the Majiatian tailings reservoir and artificial lakes, with minimal clearance above tunnel tops, requiring precise engineering. Ensuring structural safety in areas with high-rise buildings and densely populated zones.

Overall Project Impact

The second line of the Chengdu-Kunming Railway, including these bridges, forms part of the 915-kilometer double-track line that reduces travel time between Chengdu and Kunming to 7. 5 hours and significantly improves connectivity to cities like Xichang and Panzhihua. The completion of these bridges enhances the railway's capacity, safety, and operational efficiency, supporting regional economic development and integration into China's southwestern railway network.

The project demonstrates advanced engineering solutions in bridge construction, tunnel design, and vibration isolation, setting new standards for railway infrastructure in challenging terrains.

Progress of the Chengdu-Kunming Railway Second Line Bridge Construction - ROGER FIBRE ATELIER [PDF]

Progress of the Chengdu-Kunming Railway Second Line Bridge Construction

The construction of the second longest tunnel of the Chengdu

After the full line of the Chengdu-Kunming Railway is opened to traffic, it will be separated from the old Chengdu-Kunming Railway for passenger and freight, which can greatly

Chengdu–Kunming railway

OverviewHistoryCultural significanceRailway junctionsNatural Disaster VulnerabilityNew line

Planning of the Chengdu–Kunming railway began in 1952 with several routes under consideration. An eastern route would have run via Neijiang, Zigong, Yibin, Shuifu, Yanjin. Yiliang, Malong and Songming. A central route would have taken a similar route as far as Yibin and continued via Pingshan, Suijiang, Yongshan, Daguan, Qiaojia, Huize, Dongchuan and Songming. A western route would run via Meishan, Leshan, Ebian Yi,

Good news from the double-track construction of Chengdu-Kunming

According to the announcement, the project construction mainly includes the survey and design, supply, construction, testing, commissioning, inspection, and acceptance of the energy storage power

Chengdu to Kunming in 3 hours! Conditions for opening by

According to the construction schedule, the Luoze River Bridge will be completed within this year, and the construction is now gradually entering the sprint stage.

Chengdu-Kunming Railway（a railway in China from Chengdu to

Construction of the Chengdu-Kunming Railway began in 1958; between 1959 and 1969, construction was halted and resumed multiple times; the entire line was completed and opened for operation on

HSR making smooth progress in western China

Amid the country''s latest push to increase the operating mileage of railways, constructors from China Railway No 4 Engineering Group have completed building the nation''s first large-span

Chengdu-Kunming Railway: Speed, Trade, & BRI

This article explores the significant operational commencement of the new Chengdu-Kunming Railway line in China, a project representing a substantial upgrade to the existing

Double Track of Chengdu-Kunming Railway_Baiduwiki

It has a total length of 865 kilometers, a design speed of 160 kilometers per hour, and was fully opened to traffic on December 26, 2022.

A key joint of the Longchuanjiang River Bridge of the new Chengdu

A key joint of the Longchuanjiang River Bridge of the new Chengdu-Kunming high-speed railway was rotated into position on November 7, marking another breakthrough for China''s railway bridge

Faster railway links Chengdu with Kunming

The line was an important strategic corridor and provided strong transportation support for economic and social development. However, with the increasing demand, the old line''s capacity

Construction Site of Tianliuwan Grand Bridge on

The Second Chengdu-Chongqing High Speed Railway is a crucial component of China''s "Eight Vertical and Eight Horizontal" high-speed rail

Construction of Chongqing-Kunming high-speed railway

It is designed to strengthen exchanges between central Yunnan and the Chengdu-Chongqing city cluster and boost coordinated regional

The New Chengdu-Kunming Railway is open for operation on all lines

As a transportation artery connecting Chengdu, Xichang and Kunming, the new Chengdu-Kunming Railway is a key project for the development of the western part of the country

China Railway

The full-line operation of the New Chengdu-Kunming Railway further improves the railway network structure in the southwestern region and enhances railway transportation capacity, which

Operations begin on new Chengdu-Kunming Railway line

Operations started on the new 915 km long Chengdu-Kunming Railway line. Credit: Julita from Pixabay. China Railway Chengdu Bureau Group has launched the last section of the Chengdu

Railway linking Chengdu and Kunming fully operational in SW China

The new line runs through a number of cities and prefectures, such as Chengdu, Meishan, Leshan, Liangshan Yi

New high-speed railway line linking Chengdu and Kunming opens to

With a designed speed of 160 km per hour, the 915-km new line, which runs almost parallel to an existing railway link between Chengdu and Kunming, cuts the travel time from 19 hours to 7.5 hours.

Kunming and Chengdu now connected by high-speed railway

A new railway line that connects two key cities of Southwest China and plays an important role in linking the region to the ASEAN nations of South East Asia was officially launched

Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

Recent Optical Network Dossiers

Still Have a Technical Question?

Use the inquiry form to describe the product category, application, interfaces, capacity and installation environment.

Start a Project Inquiry