03.2026

European Rail Traffic Management System (ERTMS) 

The European Rail Traffic Management System (ERTMS) is a central element of the European Union’s (EU) transport policy. Its objective is to establish a common signalling and train control system across the European railway network.

Historically, railway networks in Europe relied on numerous national signalling systems developed independently by individual EU Member States. This fragmentation made cross-border rail transport technically complex and costly. It also limited interoperability between national railway networks and created significant barriers for international rail services.

ERTMS was developed to address these challenges. The system introduces a harmonised European signalling standard that allows trains to operate across national borders without switching between different national systems. In addition to improving interoperability, ERTMS aims to enhance railway safety and increase the operational efficiency of the European rail network. With this efforts, the EU intends to support the change of freight and passenger transport from road to rail.

Key System Components

ERTMS consists of two main technological components: the European Train Control System (ETCS) and GSM-R.

The European Train Control System (ETCS) supervises train movements and ensures that trains operate within authorised speed limits. It ongoingly monitors train speed and movement and can automatically intervene if operational limits are exceeded. ETCS replaces many signalling functions that were performed by national train protection systems. ETCS provides a standardised train control technology that supports interoperability and allows the gradual replacement of multiple national signalling systems across the European railway network.

The second component of ERTMS is GSM-R (Global System for Mobile Communications – Railway), which provides the railway radio communication system used for operational voice and data exchange. GSM-R allows communication between train drivers, traffic controllers, and infrastructure managers. Reliable communication is essential for train control systems and for the safe management of railway traffic, particularly on busy international corridors.

Deployment

The deployment of ERTMS forms part of the broader EU railway interoperability framework. The legal basis is primarily provided by Directive (EU) 2016/797 on the interoperability of the rail system within the European Union, adopted as part of the Fourth Railway Package.

Technical requirements for signalling systems are set out in the Technical Specifications for Interoperability relating to Control-Command and Signalling (CCS TSI), adopted by the European Commission through implementing acts. The CCS TSI define the technical standards for signalling systems and ensure their compatibility across EU Member States.

The deployment of ERTMS is also closely connected with the development of the Trans-European Transport Network (TEN-T). The revised TEN-T Regulation adopted in 2024 introduced new deadlines for the installation of ERTMS. EU Member States are required to install ERTMS on the core TEN-T railway network by 2030. The deployment across the extended network is scheduled to continue until 2050. These timelines are intended to ensure the gradual replacement of national signalling systems and the creation of a fully interoperable European railway network.

Implementation Challenges

Despite these objectives, the deployment of ERTMS has been slower than originally planned. Implementation across EU Member States has been uneven and several national networks still rely heavily on national signalling systems. Reports published by the European Commission and the European Union Agency for Railways have identified technical, financial, and organisational challenges that continue to slow down the deployment of the ERTMS.

In response, the European Union has introduced updated deployment plans and technical revisions intended to support implementation. These measures intend to reduce fragmentation between different system versions and to provide better regulatory clarity for infrastructure managers, railway undertakings, and equipment manufacturers.

Another important development concerns the future of railway communications. The current GSM-R system is expected to be gradually replaced by the Future Railway Mobile Communication System (FRMCS). This technology is designed to provide higher data capacity and support more advanced digital railway services. The transition to FRMCS is currently being prepared by the EU authorities.

The deployment of ERTMS also affects railway undertakings and infrastructure managers. Railway operators must gradually equip locomotives and rolling stock with ETCS-compatible onboard systems. This often requires substantial investment and long-term planning.

The European Union Agency for Railways (ERA) coordinates technical work related to ERTMS. ERA prepares technical specifications and cooperates with national authorities on the approval of railway vehicles and signalling equipment. The deployment of ERTMS also requires close cooperation between national authorities.

ERTMS therefore is an important  part of the EU’s efforts to modernise the European railway sector. A common signalling system improves safety and interoperability and supports more efficient rail transport across Europe. However, it is still unclear whether the system will be installed across the entire EU railway network within the deadlines set by EU law.

Grzegorz Kłodkowski

Attorney at Law (PL)