Certificate confirming fitness for work‑welding of rail materials / track components as welding to DB AG RiLi (826.1021). Certificate of qualification for welding of steel structures according to DIN 18800-7. Certificate for welding of rail vehicles and vehicle parts in accordance with DIN EN 15085-2. Certificate for the detection of welding quality requirements of DIN EN ISO 3834-2. Certificate to the supplier rating for the product‑ range "forming materials for turnouts and track components, ribbed plates" of the Deutsche Bahn AG: DB Q1-Lieferant manufacturer‑specific product qualification to manufacture products for the superstructure: DB HPQ