BS EN 17397-1:2020 pdf free.Railway applications - Rail defects.Rail defect management. BS EN 17397-1 This document specifies the defect management system the infrastructure manager uses to control the risk of severe accidents due to degradation of internal or surface defects on rails complying with EN 13674-1, EN 13674-2, EN 13674-4 and EN 15689:2009 (excluding grooved rails EN 14811一which need alternative...