@Backedoffhackedoff ’There are 4 countries in the uk, all have open borders with each other and 1 has an open border with the EU.’
Yes, indeed. There is the Common Travel Area (with certain conditions applying) between Ireland and the UK. For those who are nationals of Ireland, and/ or of the UK (again conditions applying). Think you have to have been born in either country, hold citizenship of either country, and only when travelling from one country to the other.
Through NI, the UK has what might possibly be called an open border with an EU country. It is not just any EU country though, is it? There is a historic reason for it. The island of Ireland was has only been divided (as in belonging to two different countries) into two for nigh on 100 years. There’s no reason to go into the history here, but suffice to say a great many people who live, and are from NI, wish to maintain their natural links with Ireland. So much, that the possibility for a referendum on ‘reunification’ (both in NI and Ireland) is in the Good Friday Agreement. The Northern Irish Protocol was introduced to protect the Good Friday Agreement. The GRA which the majority of people in NI (and Ireland) voted for. I think part of that was demilitarisation, and the removal of barriers. Someone may correct me on that if I am wrong.
I do think there are checks on the train from Dublin to Belfast, though. That happened to a friend of mine prior to Brexit, so maybe they do still check. She was of Indian decent, so she was wondering if that was the reason. Not just ticket, id/ passport as well, I think.
However, Ireland is not in Schengen. There should still be checks on people arriving in Ireland, even from another EU country. It is an island, so that would be by ferry or plane.