This document is limited to specifying the requirements when applying lubricant to the interface between the wheel flange and the rail (active interface), either directly or indirectly to the wheel flange or to the rail and includes both trainborne and trackside solutions. This document only covers the equipment and application of lubricant to the active interface. This document defines: the characteristics that systems of lubrication of the wheel-rail interface shall achieve, together with applicable inspection and test methods to be carried out for verification; all relevant terminology which is specific to the lubrication of the wheel-rail interface. This document only applies to the mainline railway. NOTE This document can also be used for other railways, e.g urban rail.