I am only going to be in Madrid for 1 day and will be staying in town. Can I use my US credit card (Visa) to get train tickets from the airport to town and then buy tickets at a station to go back to the airport the next day? I think most restaurant and shopping in Madrid will accept credit cards but I am not sure about train tickets. I am trying to decide if I need to get some Euro in advance before I leave US. Thanks in advance.