For trips on high-speed trains (AVE, Alvia, Avant), it is recommended to arrive at the station at least 30 minutes before departure. This is necessary to pass through security control: before entering the platform, luggage and outerwear are scanned via an X-ray machine.
Always keep your ticket handy (printed or on a smartphone screen), as it will be needed not only upon entry but sometimes upon exiting the station through the turnstiles. Watch the information board carefully: the platform number is usually announced 15–20 minutes before the train's arrival.
The station closes for the night after the arrival of the last train, so staying overnight in the waiting room is not possible. If you have a transfer, please note that luggage lockers may have limited operating hours. Keep an eye on your personal belongings, even though the station is considered a safe place with security.