This Leaflet defines the provisions relating to the quality and the manufacture of the steel used, as well as the acceptance conditions in respect of flat-bottomed rails weighing more than 35 kg per metre made of continuously cast non heat-treated steel. AncreThe chief modifications relating to technological aspects are as follows: Deletion of the ingot casting process, AncreChecking of the body of the rail, AncreModification of the acceptance gauge approval procedure, AncreRevision of point 1.4 on the execution quality, AncreDeletion of the specific tests or requirements in respect of the ingot casting process.