Renewal of ballast, rails and sleepers on so-called difficult tracks (platforms, tunnels, trenches, tight curves, presence of obstacles). TSO uses PUMA 2 and DRL-C machines, a methodology unique in France, created for the execution of this work.
- France > 2010: Ballast renewal Thionville – Agen – Villeneuve Saint Georges
- France > 2009: Total renewal of the components of the Chartreux Tunnel road in Marseille
- France > 2009-2010: Renewal of ballast tracks outside the Lyon-Marseille line
- France > 2009: Renewal of rails in Paris Est and Esbly