Unlike other international train services within the European Union where border controls have either had a long history of operation or are no longer enforced, the UK maintains concerns about customs and immigration. The inter-capital services still operate separately from the rest of the British railway network with passport checks carried out at St Pancras, Ebbsfleet International and Ashford International stations. There was concern that similar tight control would not be possible upon regional Eurostar services where separate check-in facilities at stations did not exist.