The statistic most associated with the Gotthard Base Tunnel is this: the bore under the Swiss Alps is 57 kilometers (35.4 miles) long, making it the world’s longest rail tunnel. As with most aspects of this epic construction project, it’s not quite that simple.
The Swiss Federal Railways’ shortcut under the mountains actually involved some 94.4 miles of tunneling. It also required 12.3 billion Swiss francs ($13.39 billion, at September 2020 exchange rates), up to 2,600 workers at once, some inventive engineering, and, unfortunately, nine lives. Little wonder, then, that it was a 17-year process.
The task ended Dec. 11, 2016, when the tunnel went into regular service, six months after its formal opening ceremony. The historic Gotthard Pass line, an engineering marvel of its own when it opened in…