How you can travel from Dublin towards Belfast , Dublin it is in Republic Ireland it is the capital , Belfast is capital in North of Ireland , UK . Republic Ireland use the euro coins and North of Ireland use Gbp coins , pounds . When you travel from Dublin you can take direct the train towards Belfast , the ticket return bought for one day is cheaper than 8 years ago . You can do transaction with your card in Euro but I do not know how much costs the transaction for exchange currency . I asked a guide tour Belfast and told me that 25 Euro means 20 Lire Sterline . In case if you have your bank over there you can do transaction with your own card and maybe you have a good exchange . I asked how costs a Tour Bus Belfast said 20 Lire . I did pay 20 Lire turn and back from Ireland but if wish to see it go forward .