I know there are 2 options for making a - compulsory! - reservation for a domestic medium or long-distance train in Spain. As I'll be in Spain a little over 6 weeks from now, both options (in person or calling which only gets me a 72-hour reservation) aren't possible now.
Anyone who knows what the chances are that trains are fully booked when I arrive in Spain and want to make a reservation? I'm talking about Bilbao-Salamanca with a change in Miranda de Ebro, as shown on Renfe's own website (little less than 6 hours, while the DB app shows one of 8+ hours and the Railplanner app tells me it takes more than a day).