A Milestone Moment!Chongqing Yonggui Helps the First Flexible Train in China Settle in the Mountain City

Chongqing's Metro Line 24 has achieved a landmark milestone in its construction: The first three-car As-type train has officially been delivered to Lujiao Depot, marking the start of operational preparations for the city's first fully automated rail line. This train features China's pioneering "3+3" flexible formation technology, which not only accommodates varying passenger demands but also achieves a groundbreaking breakthrough by maintaining standard door spacing during coupling operations. Behind this innovation, Chongqing Yonggui Transportation Equipment Co., Ltd. leveraged its expertise in tunnel systems to ensure the train's safe, intelligent, and efficient operation.

Innovation Breakthrough: Flexible Formation Technology First in China Applied in Chongqing

Chongqing Metro Line 24, the city's first fully automated rail transit system, operates As-type trains initially configured in 3-car formations. The system can flexibly expand to 6-car formations based on passenger demand. This innovation not only fills a critical gap in China's urban rail transit flexible formation technology but also marks a significant milestone in Chongqing's smart rail development.

Unlike conventional fixed-formation trains, flexible-formation trains can boost capacity during peak hours through coupling operations while reverting to smaller formations during off-peak periods. This operational flexibility enhances efficiency while reducing energy consumption. The tunnel passage project undertaken by Chongqing Yonggui Transportation Equipment Co., Ltd. serves as the critical component enabling this adaptive formation capability.

Technological Breakthrough: Wisdom and Resilience of the Channel System

As a critical component connecting train carriages, the passageway not only facilitates passenger movement but also requires structural stability, reliable sealing, and adaptability to the unique challenges posed by flexible formations during dynamic train operations. In the 24th Line project, Chongqing Yonggui implemented multiple innovative designs and process optimizations tailored to the technical characteristics of the "3+3" flexible formation.

Adaptive design: The through-hole system achieves a balance between lightweight and flexible structure while ensuring safety strength, guaranteeing smooth and reliable train coupling and decoupling.

Sealing Technology Innovation: To address Chongqing's rainy and humid climate, the company has developed an innovative sealing structure that effectively prevents rainwater infiltration, ensuring passenger safety and comfort.

Smart monitoring integration: The tunnel system features sensor interfaces that connect with the train's intelligent operation and maintenance system, enabling real-time monitoring of equipment status and providing data support for fully automated operations.

Enterprise Responsibility: Chongqing Yonggui drives urban arteries with technical strength

Chongqing Yonggui Transportation Equipment Co., Ltd., a locally established rail transit equipment manufacturer, has specialized in vehicle connection systems for years, developing a comprehensive product portfolio for subways, monorails, and regional railways. The company's representative stated: "We are immensely proud to contribute to Chongqing's first fully automated rail line. While the tunnel is not the train's' star,' it plays a vital role in ensuring operational safety and enhancing passenger experience."

For the Line 24 project, Chongqing Yonggui formed a dedicated technical team that rigorously oversaw every stage—from design review and process validation to production and quality inspection—to ensure products met the stringent requirements of the fully automated operation system. Despite challenges like tight R&D timelines and high technical standards, the team successfully delivered the tunneling system on schedule, meeting all design specifications and paving the way for the train's smooth deployment.

Future Outlook: The "Invisible Champion" in the Era of Smart Rail

With the continuous expansion of Chongqing's rail transit network, its operational model is evolving toward smarter, greener, and more efficient systems. The integration of Line 24's fully automated operation system with flexible formation technology represents the future direction of urban rail transit development. Chongqing Yonggui stated that this project will serve as an opportunity to further increase R&D investment, focusing on intelligent, lightweight, and eco-friendly solutions for tunnel passages, thereby contributing more "Chongqing wisdom" to rail transit construction in Chongqing and nationwide.

The train has entered the depot, marking a step closer to its official passenger service. As future passengers navigate between the carriages of Line 24, experiencing the efficiency and convenience of flexible formations, every detail connecting the carriages embodies the craftsmanship and innovation of local manufacturers like Chongqing Yonggui.

Every breakthrough in Chongqing's rail transit system serves as a powerful pulse of the city's upward growth. Within this pulsating rhythm lies the collective strength of countless enterprises that steadfastly adhere to industrial practices and courageously innovate.

Image Source: Chongqing Rail Transit

Statement: Some materials are sourced from the internet. Credit is given to the respective original authors. If infringement is involved, please contact us for removal.