The FRMCS knowledge platform
Standards, migration and operations of the Future Railway Mobile Communication System — clearly explained and linked to original sources.
Publications
ETSI has adopted three work items for FRMCS conformance testing. The UK is funding research into spectrum requirements and lifecycle management. Further updates cover equipment capabilities and a Finnish market consultation.
FRMCS Atlas now offers 48 source-linked lessons in three progressive levels—for people who need to understand FRMCS, apply it in projects or shape implementation decisions.
Reaching drivers, coordinating groups, warning of hazards and transmitting ETCS data: these tasks remain when moving to FRMCS. What changes fundamentally is the technical implementation. This comparison explains to decision-makers and engineers what that means for networks, vehicles and control centres.
The European Commission placed FRMCS on the InnoTrans 2026 agenda. Its programme identifies September 2027 as the target for completing the specifications and their testing.
FRMCS is the railway's future communication system and the successor to GSM-R. If you are new to it, start with What is FRMCS?. How requirements and technology change compared with GSM-R is shown in the GSM-R and FRMCS comparison. For planning, use the migration decision guide; every document with version and status is listed in the standards catalogue.
Fundamentals
The detailed guide: What is FRMCS?
Read →02Standards
Who specifies FRMCS and how the documents fit together.
Read →03Migration
The transition from GSM-R to FRMCS.
Read →04Operations
Operations in multi-vendor environments.
Read →FRMCS status
Plans and target ranges as published by the responsible bodies — not completed releases. Dates keep the precision of their source.
V3 preliminary (V3p) specification release planned by UIC
Source: UIC – FRMCS Mega Meeting – Aligning the next steps · Editorial check 2026-10-03
FRMCS specifications and their testing should conclude (EU InnoTrans 2026 programme)
Source: European Commission, DG MOVE – InnoTrans 2026 – Programme (session "FRMCS Is coming: be aware, be prepared!") · Editorial check 2026-10-03
V3 "FRMCS 1st Edition" — ERA-aligned UIC target
Source: UIC – FRMCS Mega Meeting – Aligning the next steps · Editorial check 2026-10-03
ERA recommendation with FRMCS specifications: December 2027 (best case) to September 2028 (worst case)
Source: ERA – Consolidated Annual Activity Report (CAAR) 2025 – Annex to MB Decision n° 400 · Editorial check 2026-10-03
Incorporation of V3 into the CCS TSI 2028 — UIC target, subject to the EU legislative process
Source: UIC – ATWG reaches a milestone with its 100th UIC FRMCS meeting · Source: ÖBB-Infrastruktur – FRMCS radio – ÖBB-Infrastruktur AG (incl. roadmap PDF, modified 10 Aug 2026) · Editorial check 2026-10-03
Briefing · waitlist
A planned email briefing on FRMCS standards, migration milestones and practical findings. It is not being sent yet: you can register your interest now and will be contacted when it starts.