Seikan is both the longest and the deepest operational rail tunnel in the world; the Gotthard Base Tunnel in Switzerland will be longer when it opens to traffic in 2017.
The Gotthard Base Tunnel in Switzerland will be longer when it opens to traffic in 2017. Seikan is both the longest and the deepest operational rail tunnel in the world.
Seikan is both the longest and the deepest operational rail tunnel in the world. The Gotthard Base Tunnel in Switzerland will be longer when it opens to traffic in 2017.
Seikan is both the longest and the deepest operational rail tunnel in the world. The Gotthard Base Tunnel in Switzerland will be longer when it opens to traffic in 2017.