Pop onto the A4 motorway near Reims—you know, that key freight artery in Grand Est that hooks Paris up with Strasbourg and on to Germany—and you’ll see a new breed of heavy-duty transport rigs swapping diesel for hydrogen fuel cells. They glide into a station, fill up in minutes, then roll out for another long haul without spewing a single gram of CO₂.The Strategic Heart of Grand EstLaunched in...