This European Standard provides a system for the identification and presentation of information about the ILU. The identification system is intended for general application, for example in documentation, control and communications (including automatic data processing systems), as well as for display on the ILU and other non ISO containers (i.e.: which dimensions and testing parameters differ from those defined by the applicable ISO standards) used in European transport. The methods of displaying identification and certain other data (including operational data) on the ILU by means of permanent marks are included. This European Standard specifies: a) an ILU identification system with an associated system for verifying the accuracy of its use, having mandatory marks for the presentation of the identification system for visual interpretation, and b) a coding system for data on ILU size and type, with corresponding marks for their display; c) mandatory operational marks; d) physical presentation of the marks on the ILU. This Part of EN 13044 specifies a system to identify the ability of an ILU to be operated at the European railway network. It combines the dimensions of an ILU with the size profile of the railway network to enable the user to select such parts of a railway network on which the ILU can be transported without danger. This part of the European Standard prescribes the system of operational data fort he codification of the ILU. The codification assigns a maximum profile for the at the rail tracks available cover area to the ILU in order to enable the selection of those rail tracks on which this ILU can be transported without any danger. This European Standard does not cover temporary operational marks of any kind, permanent marks, data plates, etc. which may be required by intergovernmental agreements, national legislation or non-governmental organisations other than CEN. NOTE Some of the major international conventions whose container-marking requirements are not covered in this European Standard are as follows: International Convention for Safe Containers (UN/IMO 1992); Customs Convention on Containers 1956 and 1972; Customs Convention on International Movement of Goods under Cover of TIR Carnets (TIR-Convention) 1959 and 1975. It should not to be assumed that this list is exhaustive. This European Standard does not cover the display of technical data on Swap tanks (see EN 1432) nor does it, in any way, include identification marks or safety signs for items of cargo which may be carried in ILU.