REFER has made significant investment to expand and modernise the national railway network, introducing extensive technological changes that have resulted in improvements in terms of accessibility and operation conditions.

The investment has essentially been aimed at improving conditions for mobility, creating new connections or reducing the time taken for existing traveltime routes, guaranteeing improved conditions for the safety and quality of the service provided while also reducing operating and maintenance costs. Work has included:

• building and completely renewing tracks, including platforms;
   
• installing or substituting overhead contact line systems;
   
• introducing new signalling and telecommunications technologies and command and Traffic Command Control systems for circulation;
   
• large-scale construction projects;
   
• eliminating level crossings and corresponding alternative accesses;
   
• fencing railway corridors;
   
• building new stations or introducing new equipment for passenger platforms and video surveillance systems;
   
• construction of interface zones;
   
• new accesses to railways.

In the past ten years REFER has invested approximately 5 billion euros in such investments to modernise railway infrastructure.