PREVIOUS
NO MORE
Railway systems across the UK are undergoing a rapid digital transformation. Modern rail networks increasingly rely on mission-critical communications, real-time telemetry, and connected infrastructure to maintain safe and efficient operations. From digital signalling and centralized traffic management to emerging rail communications standards such as the Future Railway Mobile Communication System (FRMCS) and private 5G networks, rail operators are building the foundations of a smarter and more resilient transport ecosystem.
These technologies are enabling railways to operate with unprecedented visibility and control. Control centres can monitor trackside assets in real time, train operations are coordinated through integrated communications networks, and artificial intelligence is improving incident detection, predictive maintenance, and operational decision-making.
The result is a railway system capable of delivering key outcomes: improved passenger safety, higher service reliability, reduced operational costs, and progress toward sustainability targets.
However, as rail infrastructure becomes increasingly connected, the cyber risk landscape is also expanding. The challenge for railway operators is no longer whether to digitise critical communications and operational systems—but how to do so securely, proportionately, and at scale.
Most rail organisations manage highly complex technology estates where legacy operational systems coexist with modern digital platforms. Life-expired trackside equipment, signalling systems, and operational radio networks often operate alongside cloud services, APIs, and integrated data platforms supporting modern railway control centres.
Many industrial control systems (ICS) and supervisory control and data acquisition (SCADA) environments were never designed to face today’s cyber threats. Yet they are now increasingly interconnected with enterprise IT networks, public connectivity infrastructure, and third-party service providers.
Rail operations are also deeply interconnected. Train operators, infrastructure managers, signalling suppliers, telecommunications providers, and maintenance contractors all rely on shared technology platforms and communications networks. As next-generation railway communications such as FRMCS and broadband mission-critical services are deployed, these dependencies will only deepen.
This interconnected environment creates a reality where a vulnerability in one system—or even one supplier—can quickly cascade across multiple operational domains.
At the same time, rail operators must navigate tight budgets, limited cybersecurity skills in operational technology environments, and strict expectations for uninterrupted service availability. For safety-critical railway communications systems, downtime is rarely acceptable.
The UK’s regulatory environment is increasingly reinforcing the need for stronger cyber resilience across critical transport infrastructure.
The Cyber Assessment Framework (CAF) developed by the National Cyber Security Centre (NCSC) is becoming the benchmark for outcome-focused cyber assurance across critical national infrastructure sectors, including rail transport.
Meanwhile, the upcoming Cyber Security and Resilience Bill (CSRB) will introduce mandatory compliance requirements for Operators of Essential Services and their supply chains. With implementation expected from 2027, rail organisations that build their cyber resilience capabilities today will be better positioned to meet future regulatory audits and compliance obligations.
At the same time, national investment strategies in digital rail, data platforms, control room modernisation, and next-generation railway communications such as FRMCS are accelerating the sector’s digital transformation.
For rail operators, the key challenge is ensuring cyber resilience supports innovation rather than slowing it.
As railway systems become increasingly digital and connected, the nature of cyber risk is changing.
The convergence of IT and operational technology expands the potential impact of cyber incidents. Misconfigured cloud platforms, insecure remote access, or compromised vendor systems can create pathways from enterprise networks directly into operational rail environments.
In parallel, reliance on third-party software, SaaS platforms, and managed service providers means some of the most critical vulnerabilities may exist outside an operator’s direct control.
Legacy railway systems add another layer of complexity. Flat network architectures, unsupported firmware, and temporary engineering workarounds can persist in operational environments for years, quietly increasing exposure.
Railway communications networks and operational data—ranging from train telemetry and asset monitoring to passenger information systems—also represent valuable targets. If compromised, they can create safety risks, operational disruption, and reputational damage.
Recent cyber incidents affecting critical infrastructure sectors highlight that these threats are both real and immediate.
Effective cyber resilience for the rail sector must be operational, pragmatic, and aligned with the realities of railway operations.
A strong foundation begins with outcome-based assurance aligned to the NCSC Cyber Assessment Framework, enabling rail organisations to establish a clear maturity baseline and develop practical improvement roadmaps tailored to operational constraints.
For railway systems, cyber resilience must extend deep into operational technology and industrial control environments. This includes practical threat modelling, secure system architecture, configuration hardening, and targeted security testing across signalling networks, operational communications systems, traffic management platforms, and railway control centres.
Security strategies must also reflect how railway systems are actually operated and maintained—not simply how they are designed on architecture diagrams.
Supply chain risk management is another critical factor. Leading rail organisations are embedding cybersecurity requirements into procurement processes, supplier contracts, and operational oversight. This ensures cybersecurity becomes a continuous operational capability rather than a one-time compliance exercise.
The transition to next-generation communications platforms will further increase the importance of integrated cyber assurance. Major initiatives such as the migration from Airwave to the Emergency Services Network (ESN) and the deployment of FRMCS for railway communications will underpin future rail control systems, train operations, and safety-critical communications.
Ensuring cybersecurity is integrated from the earliest design stages will be essential to maintaining public trust and operational reliability.
Strengthening cyber resilience does not necessarily require large-scale transformation programmes.
Railway organisations can begin with targeted, practical steps that deliver immediate value. A short CAF-aligned discovery exercise can identify key risks and evidence gaps. An operational technology security review of a critical rail asset can uncover vulnerabilities early. Pilot programmes for supplier cyber assurance can help reduce risk in future procurement processes.
Together, these measures build momentum while ensuring operational continuity.
Actica supports rail and transport organisations in taking these first steps with confidence. The company works with clients to conduct CSRB-focused gap analyses, clarify regulatory obligations, and identify where cyber capabilities must be strengthened ahead of mandatory compliance.
Actica also delivers CAF-aligned cyber maturity assessments and evidence-based improvement plans designed specifically for operational transport environments.
Whether preparing for the Cyber Security and Resilience Bill, strengthening cyber governance across railway communications infrastructure, or prioritising operational technology risks, Actica provides practical guidance grounded in real-world rail operations.
