Martifer Metallic Constructions is responsible for the design and construction of the elliptical roof and pedestrian ramps for the new Noisy-Champs railway station. This unique cover consists of a double elliptical helix of 101 by 62 metres and is 21 metres high. The helixes will be supported by 12 built-in columns. The steel package also includes the beams, staircases, and the structures for the access lifts of the station.