World's longest rail tunnel to open in Switzerland under Alps | Switzerland | The Guardian
Gotthard Base Tunnel quickens train travel through Swiss Alps: Travel Weekly
Fire safety for the Gotthard base tunnel – International Fire Protection
Elasticity for the track in the Gotthard Base Tunnel | Getzner Werkstoffe
Swiss Rail Update: The New Gotthard Base Tunnel, an Engineering Marvel - The Untours Blog
The Best Way Through the Alps Is the World's Longest Rail Tunnel | WIRED
15 Mind-Blowing Figures about the Gotthard Base Tunnel
Science Behind The Megastructures: Gotthard Base Tunnel | Encardio Rite
Gotthard tunnel: World's longest and deepest rail tunnel opens in Switzerland - BBC News
World's longest rail tunnel to open in Switzerland under Alps | Switzerland | The Guardian
Gotthard tunnel – DW – 06/01/2016
Swiss Alps: In the Heart of the Mountain | Time
Gotthard Base Tunnel, Switzerland - Railway Technology
World's Longest Rail Tunnel Enters Service in Switzerland
Gotthard Base Tunnel opens for passenger transport | Press | Company | Siemens
Gotthard Base Tunnel, Switzerland - Railway Technology
10 of the world's greatest tunnels | CNN Travel
World's Longest Tunnel Completed
Gotthard Base Tunnel - Wikipedia
Watch the Swiss: An extraordinary rail tunnel puts U.S. to shame | Pittsburgh Post-Gazette
Gotthard Tunnel Opens. In June this year Switzerland… | by Switzerland in the USA | Medium
After 17 years and $12 billion, Switzerland inaugurates world's longest rail tunnel - Los Angeles Times
The Gotthard base tunnel - Pfannenberg
How to build world's longest train tunnel - CNN.com
St. Gotthard Pass | mountain pass, Switzerland | Britannica
The Longest Tunnel in the World - NORMA Group Blog
Engineers meet challenge of Gotthard tunnel - SWI swissinfo.ch
