Thousands of feet under the Swiss Alps, a new high-speed, high-capacity railway is close to completion. The Ceneri Base Tunnel and the Gotthard Base Tunnel -- the world's longest railway tunnel -- will shave hours off the time it take trains to cross the mountains of Europe.
원문출처 : https://www.cnn.com/travel/article/trans-alpine-rail-tunnels/index.html
원문출처 : https://www.cnn.com/travel/article/trans-alpine-rail-tunnels/index.html