This Leaflet contains a compendium of the information to be exchanged between railway undertakings (RUs) when carrying out rail freight traffic. In multilateral rail freight traffic it is necessary to provide data for the movement of a train and the wagons, loading units and other rail vehicles that it contains to the RUs which move the train and carry out the individual transport operations. This is the basis for an efficient and economical operation of the trains and the transport operation. If this data is transmitted to the following RU at the right time it is not necessary for the participating RUs to collect it and/or capture it.