P4 overhaul in accordance with the Maintenance System Documentation (DSU)
- Replacement of the internal communication and public address systems, including loudspeakers
- Installation of induction loops throughout all vehicle cars
- Update of signals and messages displayed by onboard systems
- Application of anti-graffiti protection film to the carbody and replacement of window and door sun-protection films
- Construction of staff compartments within passenger areas
- Adaptation of vehicle infrastructure to NIS2 requirements
