New MP14 metro trainsets supplied by Alstom at the Saint-Ouen depot, in the northern suburbs of Paris, on December 3, 2020. BERTRAND GUAY / AFP If all goes well, passengers won’t notice a thing. On February 26, after two weeks of complete closure, service will resume on Paris’s metro Line 14, unchanged, between the stations Saint-Ouen to the north and Olympiades to the south. But in reality, everything will have changed. The line’s automatic control software, launched in 1998 by Siemens, will have been replaced by a new-generation tool. “The current system was still very efficient, but insufficient for the extension of the line, which will operate with three times as much rolling equipment as when it was launched,” explained Stéphane Garreau, who is in charge of this huge project for RATP, the Paris public transport body. It is to be completed before the 2024 Olympic and Paralympic Games this summer. Line 14 will be extended in two directions: by 1.5 kilometers to the north, to the new Saint-Denis-Pleyel station, and by 14 kilometers to …