This document identifies the information required to be marked on heavy rail freight wagons, or parts of heavy rail freight wagons, relating to their technical, operational and maintenance characteristics. It defines the characteristics of these markings, the requirements pertaining to their presentation, their shape and position on a vehicle and their meaning. Some markings are accompanied with a note(s) where appropriate. Tank barrel manufacturers design criteria, test and product specification plates have not been considered in this document as they are specified in EN 12561-1:2011, Railway applications Tank wagons Part 1: Identification plates for tank wagons for the carriage of dangerous goods. Where fully specified in RID (Regulations concerning the International Carriage of Dangerous Goods) Dangerous Goods markings have not been considered in this document (dimensions, colour, location and form). Where markings are not fully specified in RID they are included in this document.