The scope includes, but is not limited to, the following services for the improvement and modernisation of the AL-ANDALUS train:Lot 1: Hydraulic reform service. Lot 2: Refurbishment service of the system for opening and closing folding beds. Lot 3: Battery charger reliability improvement service. Lot 4: Service of improvement reliability of power converters.

- Comprehensive reform of the current control system for filling tanks and pressurizing cold and hot water circuits in all train cars.- Replacement of DHW tanks with new cylindrical tanks.

It will improve the current system of opening and closing the folding beds, installing a new metal structure taking advantage of part of the existing one.

Systematic changes of certain elements of battery chargers and verification of others, to achieve reliability in accordance with current operating requirements.

Transform TIRISTOR to IGBTS technology converter equipment, as well as improve the reliability of those that currently have IGBTS technology.