If Russia attacked Nato, would the continent’s crumbling bridges, mismatched rail tracks and border bureaucracy prevent troops, tanks and other reinforcements from across the Atlantic reaching the front line in time? Our visual investigation takes you through the onerous 45-day military journey across Europe. Today, our Berlin bureau chief previews a joint Franco-German effort to swing behind a pan-European tech strategy, and our Rome bureau chief reports on Italy’s move to redouble efforts to support Ukraine.