--- title: Railway Safety Automation description: Accelerate ETCS and CBTC certification. TimeZero ensures EN 50128 SIL 4 compliance, automates Safety Case generation, and modernizes legacy signaling code --- [Skip to content](https://www.timezero.dev/railway-safety-automation#main-content) [![TZero logo wtext black](https://www.timezero.dev/hs-fs/hubfs/AI-Generated%20Media/Images/TZero%20logo%20wtext%20black.png?width=1000&height=372&name=TZero%20logo%20wtext%20black.png)Homepage](https://www.timezero.dev/www.tymaton.com?hsLang=en) - [Home](https://www.timezero.dev?hsLang=en) - [Customers](https://www.timezero.dev/customers?hsLang=en) - [Automotive](https://www.timezero.dev/automotive-functional-safety-automation?hsLang=en) - [Military & Avionics](https://www.timezero.dev/military-avionics-safety-automation?hsLang=en) - [Medical](https://www.timezero.dev/-military-avionics-safety-automation-f3995570-5a0e-479a-981b-602ae2056347?hsLang=en) - [Railway](https://www.timezero.dev/railway-safety-automation) - [Technology](https://www.timezero.dev/timezero-technology?hsLang=en) - [About us](https://www.timezero.dev/about-us?hsLang=en) - [News](https://www.timezero.dev/timezero-blog?hsLang=en) - [Contact us](https://www.timezero.dev/contact-us?hsLang=en) - [Home](https://www.timezero.dev?hsLang=en) - [Customers](https://www.timezero.dev/customers?hsLang=en) - [Automotive](https://www.timezero.dev/automotive-functional-safety-automation?hsLang=en) - [Military & Avionics](https://www.timezero.dev/military-avionics-safety-automation?hsLang=en) - [Medical](https://www.timezero.dev/-military-avionics-safety-automation-f3995570-5a0e-479a-981b-602ae2056347?hsLang=en) - [Railway](https://www.timezero.dev/railway-safety-automation) - [Technology](https://www.timezero.dev/timezero-technology?hsLang=en) - [About us](https://www.timezero.dev/about-us?hsLang=en) - [News](https://www.timezero.dev/timezero-blog?hsLang=en) - [Contact us](https://www.timezero.dev/contact-us?hsLang=en) # Railway Functional Safety Automation ## Next-Gen Signaling. Zero-Compromise Safety.   ### Automate EN 50128 SIL 4 Compliance for ETCS and CBTC Systems. ##### . **TimeZero** is the world’s first **Autonomous Functional Safety Engineer** for the railway industry. We bridge the gap between legacy signaling infrastructure and modern digital control, automating the rigorous verification required for **CENELEC EN 50128 SIL 4** certification. Deliver safer trains faster, with mathematically proven reliability. [Get a demo](https://www.timezero.dev/contact-us?hsLang=en) The railway industry faces a unique contradiction: it must maintain safety-critical systems for 30+ years while integrating modern digital standards (ERTMS/ETCS). # The "Long-Lifecycle" Trap in Railway Engineering - The SIL 4 Barrier: Achieving Safety Integrity Level (SIL) 4 requires the highest level of rigor, where the probability of failure on demand (PFD) must be less than 10 −8 . Manual verification of this magnitude is slow and prohibitively expensive. - Legacy "Spaghetti Code": Decades of patches and updates create architectural erosion in signaling software. Validating changes in these fragile environments often requires full regression testing, which is time-consuming and error-prone - The Documentation Mountain: CENELEC standards (EN 50126/50128/50129) require massive documentation for the Safety Case. Manually synchronizing requirements, code, and test results for every software update is a primary cause of project delays. [Ask for a Demo](https://www.timezero.dev/contact-us?hsLang=en) ![railway challenge](https://www.timezero.dev/hs-fs/hubfs/railway%20challenge.jpg?width=572&height=1024&name=railway%20challenge.jpg "railway challenge") # Deterministic Automation for High-Speed Rail TimeZero applies advanced "Hybrid AI" and architectural discipline to solve the headaches of railway software validation, ensuring compliance from the interlocking logic to the onboard computer ## 100% MC/DC for SIL 4 (Hybrid AI) For SIL 3 and SIL 4 software, "structural testing" is mandatory. TimeZero automates this completely. ### Hybrid Solver We combine **Z3 SMT Solvers** (formal methods) with **Large Language Models (LLMs)** to generate test vectors that achieve **100% Modified Condition/Decision Coverage (MC/DC)**. This guarantees that every logic gate in your interlocking or braking system is tested and verified ### Unreachable Code Detection TimeZero identifies "dead code" (unreachable instructions) using Control Flow Analysis (CFA), ensuring that your deployed software contains only verified, executable logic as required by EN 50128 Railway projects rarely start from scratch. TimeZero helps you manage the evolution of long-lifecycle assets. ## Mastering Legacy Code with DSM ### Architectural Visualization Using **Dependency Structure Matrix (DSM)** technology, TimeZero creates a visual heatmap of your software architecture. It highlights "bad dependencies" (e.g., UI layers calling Safety Kernels directly) that violate modularity and safety concepts ### Safe Refactoring The platform acts as a guardrail, allowing engineers to refactor legacy C/C++ code for modernization (e.g., moving to LTE/5G signaling) without introducing regression faults ## Automated Safety Case Generation Turn the bureaucratic burden into an automated process. ### Traceability Matrices TimeZero automatically links Requirements → Architecture → Code → Test Results. ### Evidence Packs Generate the specific artifacts required by Independent Safety Assessors (ISAs), including Software Requirement Specs (SRS), Software Design Specs (SDS), and Verification Reports, drastically reducing the time required for final safety audits Ensure code quality from the first keystroke. ## Real-Time MISRA & CENELEC Compliance **Static Analysis** TimeZero enforces **MISRA C/C++** rules in real-time within VS Code. This prevents common coding errors (buffer overflows, uninitialized variables) that could lead to dangerous failures in Train Control Management Systems (TCMS) # Use cases ![signalling use case](https://147098122.fs1.hubspotusercontent-eu1.net/hub/147098122/hubfs/signalling%20use%20case.jpg?width=1200&length=1200&name=signalling%20use%20case.jpg) ![rolling stock use case](https://147098122.fs1.hubspotusercontent-eu1.net/hub/147098122/hubfs/rolling%20stock%20use%20case.jpg?width=1200&length=1200&name=rolling%20stock%20use%20case.jpg) ![PSD use case](https://147098122.fs1.hubspotusercontent-eu1.net/hub/147098122/hubfs/PSD%20use%20case.jpg?width=1200&length=1200&name=PSD%20use%20case.jpg) ![psd use case](https://147098122.fs1.hubspotusercontent-eu1.net/hub/147098122/hubfs/psd%20use%20case.jpg?width=1200&length=1200&name=psd%20use%20case.jpg) ## Frequently asked questions How does TimeZero handle the difference between SIL 2 and SIL 4 in railways? TimeZero scales its verification rigor automatically. For SIL 2 functions (e.g., passenger information), it may enforce standard coverage (Statement/Branch). For SIL 4 functions (e.g., emergency braking), it automatically enforces **100% MC/DC**, Boundary Value Analysis, and strict architectural independence checks, producing the exact evidence required for that specific integrity level Can TimeZero analyze "Spaghetti Code" in older railway systems? Yes. This is a core capability. TimeZero uses **Dependency Structure Matrix (DSM)** technology to analyze code dependencies. It visualizes the "spaghetti" (cyclical dependencies and layer violations) and helps engineers untangle the architecture to meet the modularity requirements of EN 50128, preventing software erosion Does TimeZero replace the Independent Safety Assessor (ISA)? No, the ISA is a mandatory human role in rail certification. TimeZero acts as a "force multiplier" for the engineering team. It prepares the **Evidence Packs** and **Safety Cases** that the ISA reviews. By ensuring the data is complete, traceable, and error-free before the audit begins, TimeZero reduces the likelihood of findings and costly re-assessments Is TimeZero compatible with tools like Cantata or VectorCAST? Yes. TimeZero is a "Total Testing Platform" that can integrate with existing toolchains. However, it offers superior value by combining Test Generation, Static Analysis, and Architecture Analysis into a single autonomous workflow, often replacing disjointed tools to reduce licensing costs and complexity ## Keep Your Projects on Track. Automate the road to SIL 4 and eliminate certification bottlenecks. [Get in touch](https://www.timezero.dev/contact-us?hsLang=en) [![TimeZero black background](https://www.timezero.dev/hs-fs/hubfs/AI-Generated%20Media/Images/TimeZero%20black%20background.png?width=1024&height=1024&name=TimeZero%20black%20background.png "TimeZero black background")](http://www.tymaton.com) - [Home](https://www.timezero.dev?hsLang=en) - [Customers](https://www.timezero.dev/customers?hsLang=en) - [Technology](https://www.timezero.dev/timezero-technology?hsLang=en) - [About us](https://www.timezero.dev/about-us?hsLang=en) - [News](https://www.timezero.dev/timezero-blog?hsLang=en) - [Contact us](https://www.timezero.dev/contact-us?hsLang=en) --- © 2026 TimeZero. All rights reserved.