The viaduct will connect Massy-Palaiseau and the planned CEA Saint-Aubin station, near the Saclay Atomic Energy Commission (CEA), in the middle of Line 18.

Construction of the viaduct will take 30 months and is expected to employ around 400 workers.

The consortium is led by Vinci Construction Grands Projects, and also includes Vinci subsidiaries Dodin Campenon Bernard, Chantiers Modernes Construction and Freyssinet, as well as Fayat Group subsidiary Razel-Bec.

Vinci, as part of a separate consortium with Spie Batignolles, was previously awarded a €799m contract for the construction of an 11.8km tunnel linking Antony, Massy Opéra and Massy-Palaiseau stations, and the crossing of the future Orly Airport station. Work on this section is already underway.

The 35km Line 18 will be automated at Grade of Automation (GoA) 4, and will run from Orly Airport via the Saclay plateau to Versailles Chantiers. The line will interchange with Line 14 at Orly Airport; RER lines B and C and TGV services at Massy-Palaiseau; and RER Line C and mainline trains at Versailles Chantiers.

Construction of the line will be carried out in three stages. The first section, between Massy-Palaiseau and CEA Saint-Aubin, is scheduled to open in 2026, with the Massy-Palaiseau - Orly Airport section following in 2027, and the CEA Saint-Aubin and Versailles Chantiers entering service in 2030.

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