Technical details
Customer
SNCF Réseau (PPP with Oc’Via until 2037)
Dates

2012: award of the contract to the Oc’Via group
2013: submission of the design studies
2014: start of the civil engineering
2016: Rail equipment phase of the line
2017: start of freight train movements
2018: start of passenger train movements

Missions
Integrated project management
Localisation
France
Partners
Oc’Via group (SYSTRA, Setec, Bouygues Construction, Colas rail, Spie Batignolles and Alstom)
Perimeter
Design studies; works supervision; testing and commissioning
Activity
High speed

As leader of the engineering group Oc’Via, SYSTRA was responsible in particular for the integrated project management of the design and execution of the Nîmes-Montpellier Bypass (CNM) line. This is the first mixed-use high speed line in France, carrying both passenger and freight traffic on the same tracks.

Our engineering teams worked on the project alongside Setec, from the initial studies in 2012 up to the first running of a high speed train on the line in 2018. This high speed train, referred to by its acronym ‘CNM’, enables 20 minutes to be gained on the journey time between Paris and Montpellier, henceforth reduced to less than than three hours. With 60km of new line and 20km of connection track, this bypass is good for rail links in the south of France as it allows the existing line to be relieved, thereby contributing to the improvement in the regularity of regional express trains (TER).

Thus, on a daily basis 20 freight trains and more than 10 passenger trains use the CNM, characterised by the creation of two new stations, 11 viaducts and 175 engineering works. This project also includes the following innovations:

  • A sub-layer of bitumen-bound gravel for the track infrastructure, which improves the resilience of the line and speeds up construction time;
  • Crosswind detectors during mixed traffic between high speed and freight trains;
  • And signalling that can manage different traffic speeds (from 220 to 300km/h).

In particular, SYSTRA ensured the technical design, the safety management, the integrated project management, the control and technical checks of infrastructure works and rail equipment, all the test phases (technical, dynamic and ramp-up speed tests), compilation of the line’s Safety File, as well as its connection to the national rail network.

The first mixed and progressive HSL in France, the CNM is a demonstration of SYSTRA’s multidisciplinary know-how in creating new lines.

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