Independent Risk Assessment Facilitation Training
Train your staff in the investigative mindset of an independent challenger — bottom-up FMEA and top-down FTA to challenge internal design assumptions.
Digital Courses/Catalog/ Rail
For signaling, rolling-stock, and train-control engineers, this advanced workshop covers the RAMS lifecycle and the structure of a defensible safety case under EN 50126/50128/50129 — including independent software review and high-integrity argument construction.
Manage the RAMS lifecycle under EN 50126
Structure a high-integrity safety case under EN 50129
Scope independent software functional-safety reviews (EN 50128 / 50657)
Author ConOps so processor-based systems interact safely with operators
A structured path from fundamentals to audit-ready evidence. Expand any module to see its lessons.
5 modules · 15 lessons · Certificate of completion

Ben Twombly
Founder & CEO · Principal Safety Engineer
Ben Twombly is the founder of Critical Systems Analysis and the principal engineer behind every CSA program. He holds an FS Engineer certification from TÜV Rheinland and the Industrial Functional Safety Professional (IFSP) certification.
Before founding CSA in May 2023, Ben spent six years as a Senior Safety Engineer at TÜV Rheinland, preparing clients for safety assessments across a wide range of safety-critical systems. He earned his degree in robotics from the Colorado School of Mines. At CSA he works with robotics companies, autonomous vehicle manufacturers, industrial machinery firms, battery management system developers, and rail transit organizations across the U.S., Canada, and Europe.
Secure seats now, or talk to an instructor about a private cohort for your engineers.