Hi, this is Devidsmith. I have knowledge of EN 15085 Certification, which defines the quality requirements for welding in the manufacture and maintenance of railway vehicles and their components. It ensures that organizations implement controlled welding processes with qualified welders, certified welding coordinators, and approved welding procedures (WPS/WPQR). The certification is structured into levels (CL1 to CL4) based on the safety significance of the components.