In a liberalised European rail transport market, ongoing efforts are made to accelerate international freight traffic by eliminating to a large extent checks and formalities at the borders. For this purpose it is essential that consignments are handled in accordance with rules from the moment they are accepted at the handover site (siding, station, port, container terminal, etc.). This includes ensuring that they can be properly identified, i.e. ensuring as per legal requirements that the goods due to be conveyed are unaltered upon receipt. In this respect seals only ensure that tampering during the journey can be identified. Proper identifiability is a requirement of customs law (transit procedure, export procedure) which is met by affixing seals (sealing packages, sealing the space containing the goods) or providing a description of the goods in accordance with the relevant requirements. Under the simplified transit procedure for rail, railway undertakings (RUs) ensure compliance with the principle of identifiability under customs law as part of their role as carriers. The present guidelines define the recognised and standardised EUROPLOMBS as the minimum requirement for sealing spaces in which goods are contained for conveyance by rail, and include a checklist for affixing seals on wagons and intermodal transport units. The checklist was prepared due to the variety of types and sealing devices.