some, MM, if they are refundable.
Can I exchange my tickets?
This option lets you make changes to tickets purchased, if the fare allows up to an hour and a half before the train departs its station of origin, with costs established according to the rate selection.
The steps are:
1. Search Bills:
* Enter text in the box for the pager or ticket code to search.
* You can enter up to 10 pagers or ticket code to search.
* Click the Search button.
* Select the locator or ticket codes to change.
* Click on the Continue button.
* Now we just have to make the search for new trip to perform with the conditions you see fit.
2. Remaining steps:
* From this point the steps are the same as in the case of purchase of tickets.
https://w1.renfe.es/vol/Sorry! the information is only in Spanish,