This technical standard specifies the characteristics of cast railway wheels for use on European networks. Two steel grades, C ER7 and C ER8, are defined in this Technical Specification. For tread-braked wheels; only C ER7 is used. This Technical Specification is applicable to cast wheels which have a chilled rim. The standard is only applicable to cast wheels that have satisfied the technical approval procedure according to CEN/TS 13979-2. This Technical Specification applies only to wheels used in freight wagon applications for speeds up to and including 120 km/h.