Schweiz eröffnet längsten Tunnel der Welt | eurotopics.net
Gotthard tunnel: World's longest and deepest rail tunnel opens in Switzerland - BBC News
List of tunnels in the Alps - Wikipedia
The New Rail Link through the Alps (NRLA) serving Europe
Euro Tunnel | Die größten Tunnel der Welt
Switzerland Builds the World's Longest Rail Tunnel - News - Investors in Property
New Swiss Alps tunnel set to transform Europe's rail links
Newly completed Swiss tunnel to transform European rail travel | News | DW | 04.09.2020
World's longest rail tunnel to open in Switzerland under Alps | Switzerland | The Guardian
Zimmerberg Base Tunnel - Wikipedia
Newly completed Swiss tunnel to transform European rail travel | News | DW | 04.09.2020
Wie die Schweiz einen Alpen-Tunnel fast pünktlich fertigstellt
Swiss declare Alps tamed as Gotthard rail tunnel opens – EURACTIV.com
Gotthard tunnel: World's longest and deepest rail tunnel opens in Switzerland - BBC News
Beneath a Mountain in Switzerland Lies the World's Longest Shortcut | Travel| Smithsonian Magazine
World's longest railway tunnel, Gotthard Base Tunnel, Switzerland | AFRY
Newly completed Swiss tunnel to transform European rail travel | News | DW | 04.09.2020
Mont Blanc Tunnel, France, Italy, and Switzerland | Building the World
Regelbetrieb am Gotthard
