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CBTC Upgrade Enhances Paris Metro Line 8
Alstom to deploy I-CBTC onboard control system for RATP under OCTYS 2030 modernization program.
www.alstom.com
Alstom has been selected by RATP, on behalf of Île-de-France Mobilités, to supply its I-CBTC onboard automatic control system for Paris metro line 8.
The contract forms part of the OCTYS 2030 program, which aims to modernize signaling and automation across the Paris metro network and support the introduction of new MF19 trains by 2029.
Communication-Based Train Control for Higher Performance
Alstom’s I-CBTC system is a Communication-Based Train Control (CBTC) solution designed to improve train operations through real-time communication between trains and infrastructure.
The system enables shorter and safely managed train spacing, increasing line capacity while maintaining safety. Continuous supervision of train movement improves operational reliability and service regularity for passengers.
The solution complies with the OCTYS framework and meets current international standards for safety, cybersecurity and system reliability.
GoA2 Automation with Onboard and Radio Systems
The contract includes two main components: an onboard automatic control system operating at Grade of Automation 2 (GoA2), where a driver remains present, and a radio communication system enabling data exchange between trains and trackside infrastructure.
Alstom is also responsible for coordinating the overall automatic driving system, ensuring integration across all components.
Long-Term Collaboration with RATP
The project builds on a long-standing partnership between Alstom and RATP in modernizing the Paris metro. Over the past two decades, several lines—including lines 5, 6, 9, 10 and 11—have already been equipped with OCTYS onboard solutions.
More than 200 metro trains in Paris currently operate using Alstom’s I-CBTC technology, supporting over 350 million passenger journeys annually.
Multi-Site Engineering and Deployment
Three Alstom sites in France will contribute to the project:
- Aix-en-Provence will handle project management, system development and engineering
- Saint-Ouen will manage radio deployment studies, installation, testing and commissioning
- Villeurbanne will supply electronic equipment and support reliability and maintainability
Alstom will oversee the full lifecycle of the system, including development, validation, installation and commissioning.
Supporting Digital Rail Transformation
The deployment of I-CBTC on line 8 is part of a broader effort to digitalize urban rail systems, improve operational efficiency and enhance passenger experience.
With extensive expertise in signaling and over 2,000 specialists in digital mobility in France, Alstom continues to play a key role in advancing smart and sustainable urban transport infrastructure.
