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THE CORRECT ANSWER: Gotthard Base Tunnel

The Gotthard Base Tunnel is an exceptional railway structure inaugurated in 2016 in Switzerland. Stretching an exceptional 57 kilometres across the Alpine massif, it holds the title of the longest railway tunnel on the planet. Its demanding construction lasted nearly two decades and required the extraction of millions of tons of rock. Designed without a marked slope, this flat tube allows high-speed passenger trains as well as heavy freight convoys to cross the natural barrier of the Alps in record time. By capturing a major share of transalpine freight, this strategic infrastructure promotes the modal shift from road to rail. It significantly improves economic connections between northern and southern Europe, while reducing the overall carbon footprint of freight transport on the continent.