Existing differences between national railway systems will make necessary some exceptions in the harmonisation of railway systems, so that no Member State shall have to face inordinate difficulties and so that current railway transport will not be jeopardised.
På grund af forskelle i de nationale løsninger er der ved integrering af jernbanerne dog brug for enkelte undtagelser, så ingen medlemsstat skal komme i urimelige vanskeligheder og de eksisterende jernbanetransporter ikke bringes i fare.