- A complete end-to-end 5G critical communications solution has been successfully tested on a high‑speed railway line, ensuring voice, signalling and positioning data services, and video transmission according to the specifications defined for FRMCS.
- The tested solution incorporates private 5G infrastructure, onboard equipment, dispatch systems, and terminals with MCX server and client technology, all within a cybersecurity‑hardened environment.
Zaragoza, 26 February 2026
The MoySEST project has reached an unprecedented technological milestone by successfully completing the first field trials of a full FRMCS (Future Railway Mobile Communication System) solution, incorporating private 5G infrastructure, onboard equipment, dispatch systems, and terminals with MCX server and client technology, all within a cyber‑secured context.
At a time when the current train‑to‑ground communications system, GSM‑R, is entering a phase of obsolescence, the MoySEST project sets a new milestone on the path toward a new generation of railway communications that meets the demands of modern, digitalised and safe transportation.
“MoySEST was born with the ambition of driving a critical, resilient and interoperable solution that would meet FRMCS standards and allow us to consolidate the path toward a new context of railway communications, observing the implemented technologies from every angle, especially efficiency, performance and reliability. After 36 months of collaborative work, the project has demonstrated its proposal in two real use scenarios,” explains Teltronic’s CTO, Alfredo Calderón.
A section of the Madrid–Alicante high‑speed line was provided with 5G coverage for the trials.Throughout 2025, in the final stage of the project, the observation and validation of the technological solution was carried out in two real‑world use scenarios under controlled conditions. The first testing phase took place in Durango (Biscay), on a section of the commuter rail network in collaboration with ETS (Euskal Trenbide Sarea) and Euskotren. A private 5G network, onboard equipment and dispatch systems were deployed. This scenario, which combines open‑air track sections and tunnels, served to observe and validate communication assumptions in urban and metropolitan environments.
The second and final testing phase, even more ambitious and entirely pioneering, was conducted on the high‑speed line between Madrid and Alicante, in collaboration with Adif. A train equipped with an MCX and 5G onboard system carried out runs for more than a week along an almost 40‑km section where an optimised 5G infrastructure had been deployed for this test scenario, while communications were made and correct operation was monitored from a control centre set up for the occasion.
The results were conclusive: the solution demonstrated, under real railway operating conditions, its ability to function while guaranteeing the transmission rates, priorities and quality of service required for each type of train‑to‑ground communication. The high‑availability and high‑security architecture ensured that train‑to‑ground communications were maintained at all times, guaranteeing voice services, critical data (signalling and positioning) and real‑time video. In terms of cybersecurity, every induced anomaly was detected, logged and countered.
“The tests conducted during the MoySEST project have demonstrated for the first time the smooth and complete operation of an end‑to‑end solution; the interaction of all elements — 5G infrastructure, onboard equipment, control centre, terminals and MCX applications — under an integrated vision demonstrates the robustness of the solution, allows us to understand what the optimal footprint is for deployments in each use scenario, and strengthens the path toward the adoption of FRMCS as the new reference standard in railway communications,” Calderón notes.
MoySEST represents an example of applied innovation, with an international outlook and a commitment to interoperability. At a time when rail transport is consolidating its role as a pillar of sustainable mobility, the project anticipates the future with a solid and scalable proposal, enabling the introduction of new applications that make transport even more efficient and safe.
Funded by the European Union – NextGenerationEU
MoySEST was one of the initiatives selected in the 2022 call of UNICO Sectorial 5G, the programme supporting major 5G sectoral digitalisation projects financed by the Ministry of Economic Affairs and Digital Transformation and the European Union – NextGenerationEU within the framework of the Recovery, Transformation and Resilience Plan and the Recovery and Resilience Facility.
The project has been led by Teltronic, whose contribution has covered both the overall coordination and validation in real operating environments, as well as technical work in various work packages, including 5G network architecture, onboard and dispatch equipment, and its MCX/FRMCS server‑client solution.
It has also counted on the participation, within the consortium, of S2GRUPO, responsible for leading cybersecurity aspects associated with the railway sector’s transition towards 5G networks and for identifying and developing security strategies; Nemergent, which provided the logical and server layer that powers the FRMCS ecosystem, ensuring alignment with 3GPP standards and UIC/ETSI specifications; and Kenmei Technologies, which developed components in a Cloud environment to monitor and optimise the deployed private 5G networks, including the definition, development and automation of statistics calculated based on 3GPP specifications and Root Cause Analysis algorithms.
