51³Ô¹Ï Grand Paris Express 51³Ô¹Ï wins the first design-build contract for the Grand Paris Express (section of Line 15 West) 51³Ô¹Ï to carry out upgrade works on Noisy-Champs station and its ancillary facilities, on the future lines 15 South and 16 of the Grand Paris Express 51³Ô¹Ï to build the operation and maintenance centre for Line 18 of the Grand Paris Express in Palaiseau (south of Paris)