It was what Lawrence Durrell described as ‘the flickering of steel rails over the arterial systems of Europe’s body’ that steadily transformed nineteenth-century Europe into a cultural and social unity that would last until the outbreak of World War I. Not everyone was happy about this. Rossini, who was terrified of trains, stuck to coach travel, while others, including the German poet Heinrich Heine, took a sort of reverse-Brexit view, writing: ‘I feel as if the mountains and forests of all countries are advancing on Paris. Even now, I can smell the German linden trees; the North Sea breakers are rolling against my door.’