Inauguration of Line b of the metro in Rennes

Twenty years after the opening of the first line, Line b of the Rennes metro became operational on September 2022.

The works of Works Package 1 were carried out by a joint venture composed of Dodin Campenon Bernard (leader), GTM Ouest, Botte Fondations (all VINCI Construction), Spie batignolles génie civil, Spie batignolles fondations and Legendre. They included driving a tunnel (length: 8.5 km; diameter: 9 m), at a depth of 30 m, using an earth-pressure TBM, and the creation of nine stations (four of them equipped with a geothermal system), of which two connect with Line a. 90,000 people a day are expected to use the line.

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