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Paris $39 Billion Metro Lures Bouygues to Rare Project

Deep inside a dark and damp tunnel under the Saint-Lazare train station in Central Paris, David Petreco points to the wall of a cul-de-sac.

“We’re going to break that wall and drill a tunnel of 8 kilometers to connect the east of Paris to its west,” Petreco, the head of the project at the French railway SNCF, said in an interview. The link is part of a 30-billion-euro ($39 billion) government plan to build 200 kilometers (124 miles) of new metro lines and 72 stations in and around Paris by 2030.