Which Swiss engineering marvel is currently the longest and deepest railway tunnel in the world?
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Opened in 2016, the Gotthard Base Tunnel stretches for a remarkable 57 kilometers (35 miles) beneath the Alps. It took 17 years to build and allows high-speed trains to slice through the mountains at flat ground levels, bypassing winding mountain passes entirely. Photo: Hannes Ortlieb (Diskussion), Wikimedia Commons, CC BY-SA 3.0 de.
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Source: Wikipedia (CC BY-SA)
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