 As such, travellers into Sweden from Denmark (but not the reverse) must show a valid passport or national ID card (citizens of EU/EEA countries) or passport and entry visa (if required) for nationals of other non-EU/EEA countries.The move marked a break with 60 years of passport-free travel between the Nordic countries.For the rail connection, these checks were initially enforced by legally requiring the train companies to verify the identities of travellers into Sweden, with a fine of SEK 50,000 as punishment for serving those without such identity documents.