What is EN50128?

EN 50128 is a European standard that specifies the requirements for the development of safety-related software for railway control and protection systems. It covers the entire software lifecycle, from requirements specification to validation and maintenance, and defines safety integrity levels (SILs) to classify the risk associated with different software functions. The standard provides guidance on software development processes, techniques, and tools to ensure that the software meets the required safety levels. It is widely used in the railway industry to ensure the safety and reliability of train control, signaling, and communication systems.