In recent years, the railway sector has significantly accelerated its digitalisation process. Advanced Passenger Information Systems (PIS), onboard communications, CCTV, remote monitoring, predictive maintenance and connectivity solutions are now an integral part of the technology strategies of manufacturers, operators and maintenance providers.

However, as these solutions have been progressively integrated into rolling stock, a new challenge has emerged. The issue is no longer simply about introducing new functionalities, but rather ensuring that systems developed at different times, by different suppliers and based on diverse architectures can coexist, integrate and evolve efficiently over the course of decades.

In a sector where the service life of a fleet can easily exceed 30 years, the ability to manage this complexity has become as important as the technology itself. Railway digitalisation is no longer just about deploying new systems, but about ensuring they can be maintained, upgraded and continue delivering value throughout their entire lifecycle.

Integration: The Real Challenge of Railway Modernisation

Most current projects are linked to modernisation and retrofit programmes. Operators are looking to extend the service life of their fleets, while manufacturers must respond to new functional, operational and maintenance requirements without compromising the reliability of existing systems.

In this context, onboard systems integration has become a critical factor. Interoperability between subsystems, obsolescence management, component reuse and minimising vehicle downtime are now key determinants of the success of any modernisation programme.

Industry experience shows that the success of these projects does not depend solely on the quality of the installed equipment or the functionalities added. Above all, it depends on the ability to integrate technologies from different generations and ensure their future evolution without increasing operational complexity or maintenance costs.

As a result, the industry is moving towards more open, modular and scalable architectures that allow new capabilities to be incorporated without unnecessarily increasing the technical complexity of the platforms. The evolution of the railway sector demonstrates that the success of digitalisation no longer depends solely on the technology deployed, but on the ability to integrate, maintain and evolve it efficiently over time.

System Evolution Requires New Approaches

As project complexity increases, addressing integrations through entirely new developments becomes progressively less efficient. The need to reduce delivery times, minimise risks and ensure the long-term sustainability of solutions is driving approaches based on software asset reuse, proven architectures and well-established integration methodologies.

After more than 25 years participating in onboard systems integration projects for the railway sector, Bilerro Solutions has transformed its accumulated expertise into its own software ecosystem, comprising microservices, reusable components, optimised embedded operating systems, and tools for remote management, system monitoring and maintenance.

This combination of experience and technology enables new projects to be built on a solid and validated foundation, accelerating integration processes and facilitating system evolution throughout the entire lifecycle. The result is greater implementation agility, reduced technical risk and optimised development and maintenance costs.

For manufacturers, this means reduced engineering effort and faster deployment of new functionalities. For operators, it facilitates obsolescence management and the progressive modernisation of fleets. For maintenance providers, it delivers tools that enhance remote monitoring, advanced diagnostics and the implementation of condition-based maintenance strategies.

The growing complexity of railway systems will continue to drive new requirements for integration, interoperability and lifecycle management. Addressing these challenges will require a combination of sector expertise, practical experience and technologies capable of evolving at the same pace as market demands.