We are not happy with Trainline or Renfe trains. We went to Spain for 3 weeks in September 2025. As part of our travels we wanted to travel by train. I tried to book directly through Renfe, but their online booking system would not process my credit card, which is an issue with Renfe I had read about and still is a problem. After trying several times on different days, I gave up and booked using the Trainline App. On September 14 we went from Madrid to Sevilla on Renfe Alvia 02104, which was OK. On September 17 we went from Sevilla to Cordoba, return. The trip to Cordoba was Ok, but the trip back to Sevilla on Renfe Alvia 00697, was 1 1/2 hours late. We asked to change to a different train, but because we had booked using Trainline, Renfe couldn’t help us. The worst experience was our trip on September 19, from Sevilla to Barcelona on Renfe Ave 03943, Comfort class. The mix of cars had been changed since we booked, and we were arbitrarily assigned to a new car and seats. The seats we had booked were side by side, not facing anyone. The seats were given faced two other seats with a permanent table between, no foot rest and a damn rattle near by. The worst seats to have to sit at for 6 hours. We asked if we could be moved, but were told that the train was full and after looking at our tickets were told that we had probably been assigned the bad seats because we had booked through Trainline. I do not recommend booking using Trainline or traveling by train in Spain.