Signalling power resilience: dual feeds, autonomy and proof
In a world where reliability is paramount, our commitment to signalling power resilience stands firm, ensuring that dual feeds and autonomy work in tandem to create a robust framework for the future of railways. By harnessing cutting-edge technology and implementing consistent backup systems, we provide a solid foundation that supports uninterrupted service, even in the face of challenges. Our dedication to proof of performance not only safeguards operations but also instills confidence in drivers and stakeholders alike, as we pave the way for a modern, efficient transport network that prioritises safety and resilience at every turn.
Size with facts
Sizing UPS signalling power batteries is not a paper exercise. Relying on design loads or broad assumptions can leave systems exposed. For example, signalling circuits often have fluctuating consumption depending on route setting, failure modes, or seasonal factors like cold weather and condensation heating loads. If you design only on “typical” figures, you risk serious under-provisioning. On the other hand, padding margins with arbitrary percentages can result in overspending on unnecessary battery strings and oversized UPS cabinets.
The most robust approach is to measure actual operational loads. Data logging over a representative period—ideally including peak usage scenarios—gives a true picture of the power profile. This allows engineers to model not only steady-state demand but also transient surges, such as when telecom switches reinitialise or heaters cut in. With these facts in hand, the UPS and batteries can be specified with precision, ensuring that capacity matches the real-world environment rather than theoretical estimates.
Furthermore, designing with accurate data future-proofs the system. By including allowances for expected asset growth—such as additional telecom racks or upgraded signalling processors—engineers avoid costly redesigns later. Professionals understand that railway infrastructure is dynamic, not static, and a carefully measured baseline is the only way to build resilience into standby power systems.
Prove autonomy
Battery autonomy is often assumed rather than proven, but assumption doesn’t keep trains moving. Manufacturers may quote impressive figures, but those figures are based on new cells in controlled conditions. Real-life operation introduces variables: ageing effects, ambient temperature, cable resistance, and even how evenly the load is distributed across strings. Without proving autonomy through timed discharge tests, you simply don’t know whether your system will deliver the duration required.
A proper autonomy test means running the UPS and batteries under real load for the expected outage duration—sometimes an hour, sometimes several. Documenting the results creates hard evidence that can be shared with operations and safety teams, building trust in the resilience of the installation. For safety-critical signalling power systems, this documented assurance is invaluable; it removes ambiguity and demonstrates compliance with operational and regulatory expectations.
Beyond initial commisioning, autonomy should be re-proven periodically. Batteries degrade over time, and small reductions in capacity may go unnoticed until it is too late. Regularly scheduled tests provide trend data, highlighting when strings are approaching the point where replacement is necessary. This data-driven approach means budgets can be planned with foresight, avoiding emergency call-outs or unexpected outages. In short, proving autonomy is not a one-off task but a continuous commitment to reliability.
Keep it accessible
Designing UPS and battery systems is not only about capacity and runtime—it’s also about where and how the equipment is placed. Many installations fail because access for maintenance is an afterthought. Batteries tucked into damp basements, or UPS cabinets placed in cramped corners, make routine inspections a safety risk. Engineers end up working in awkward conditions, sometimes in poor lighting, sometimes in foul weather, all of which increases the chance of mistakes.
A good design anticipates the reality of field maintenance. This means ensuring that cabinets have clear working space around them, batteries can be swapped without heavy lifting risks, and enclosures provide adequate environmental protection. For outdoor or trackside locations, weatherproof housings with proper drainage and ventilation are essential. Accessibility is not a “nice to have”—it directly affects reliability because systems that are easier to inspect and maintain are serviced more often and with less disruption.
Accessibility also extends to documentation and labelling. Clear schematics, safe isolation points, and well-labelled terminals speed up troubleshooting and reduce errors during interventions. When operations depend on reliable power, the ability to quickly and safely replace a battery or reset a UPS is not just convenient—it’s critical. By designing with access in mind, organisations safeguard both the integrity of their equipment and the safety of the teams working on it.
