The Empoli–Siena upgrade project includes the electrification of the entire section and the doubling of the track between Empoli and Granaiolo over a distance of approximately 10 km, running parallel to the existing track.

With regard to the section where the line is being doubled, plans also include the removal of all level crossings along the line, the installation of new train control systems, and improvements to accessibility at the Ponte a Elsa station.

 The interventions will lead to increased metropolitan services and a higher operating speed on the Florence-Siena connection.

The Empoli - Siena project has received partial public funding.

With effect from 12 March 2026, the date on which Decree-Law No. 36 (published in the Official Gazette No. 58 of 11 March 2026) came into force, in accordance with Article 5 of that decree, the Chief Executive Officer of RFI SpA has taken over from the previously appointed Extraordinary Commissioners.