Signalling and telecommunications systems are essential to passenger safety and to the performance of transport systems. Improving these systems, although complex, is the most effective way of increasing passenger service levels and operating profits, while minimising capital expenditure.

Technologies and standards for control, command and communication are constantly evolving, offering infrastructure managers and operators new opportunities to increase safety and improve performance, while reducing costs. For example, automatic train supervision and control can considerably reduce the intervals between trains, allowing more trains to run and more passengers to be carried on the same infrastructure.

The latest-generation communication systems give operators real-time visibility of all areas of their networks, enabling them to anticipate faults and incidents and minimise disruption to operations.


We have extensive experience in designing and building control, command and communication systems for new lines and upgrades to existing lines. We work with our clients to establish the most appropriate functional, technical and performance requirements specifications for their projects, taking into account interfaces with all other systems.

Migrating an existing transport network to new systems requires in-depth knowledge not only of the technologies involved, but also of the security and operating environment. Our engineers are used to working in the most complex environments, providing feedback from similar projects around the world to ensure that the operation of your assets is not affected by the implementation of a new system.


We propose long-term investment and maintenance plans to manage system obsolescence and interoperability.

We use our knowledge of the solutions available on the market and our constant research into innovative solutions to propose the most relevant solutions. We participate in numerous working groups on international standards, enabling us to bring a unique perspective to your projects.

We can help you migrate existing systems to improved or preserved levels of automation, right up to the implementation of fully automatic metro lines. On long-distance rail lines, we help you deploy advanced train control systems in complex, mixed passenger/freight networks. Where appropriate, we combine several types of signalling solutions for urban and inter-city networks to ensure a smooth and optimised journey. Careful migration is also offered from the outset of a project to ensure continuity of service.


The benefits in terms of safety, performance and capacity of new control, command and communication systems can be considerable, at a fraction of the cost of new infrastructure (e.g. a new line). We constantly monitor trends, new technologies and, in some cases, help to define them. With this knowledge and our understanding of the operational and security environment, you can be confident that technical risks are being managed effectively.

Did you know?

There are more than 80 driverless metro lines in the world (source UITP) and GSM-R (Global System for Mobile Communications – Rail) ensures secure communications between the track and trains on 250,000 km of railway lines worldwide (source UIC).

See our booklet “the future of the metro”

Our mobility experts have teamed up with journalists from Usbek & Rica magazine to look at the possible futures of the metro, at a time when the proliferation of technological inventions is reshuffling the cards of urban mobility.