The Simplon Tunnel linking Brig with Domodossola (in Italy) is 19.8 km (about 12 miles) long. It was originally completed in 1906 as a single-track (and single 'tube') line . The St Gotthard Rail Tunnel (from Goeschenen to Airolo) is 15 km (about 9 miles) long and is entirely in Switzerland. It was opened in 1882. For its time it was a spectacular feat of engineering but cost the lives of about 200 workers.
Switzerland
The Earth's largest railroad tunnel is the Seikan Tunnel in Japan, which is over 33 miles long. When the Gotthard base tunnel in Switzerland is opened in 2016, Seikan Tunnel will be the second longest.
The world's longest railroad tunnel is the Seikan Tunnel, it is 33.49 miles long.
Currently: Sei-kan tunnel in Japan In 2010: Gotthard Base in Switzerland
The Gotthard Base Tunnel is the second longest tunnel in Switzerland, measuring about 57 kilometers in length. This rail tunnel runs underneath the Swiss Alps and serves as an important transportation route connecting northern and southern Europe.
The world's longest canal that is also a tunnel is the Rove tunnel located in France. It was built in 1974. The longest tunnel in the world is a railroad tunnel that is 35 miles long through the Swiss Alps.
The Eisenhower Tunnel is the longest vehicular tunnel.
It will be the 34 mile long St Gotthard beneath the Alps, Switzerland, when the tunnel opens in 2017. Until then, the Seikan Tunnel in Japan at 33 miles long
Hebesberger UT (Rossleithen) has the longest tunnel
Park Avenue Tunnel - railroad - was created in 1876.
East Side Railroad Tunnel was created in 1908.
The world's longest canal tunnel is the Rove Tunnel in France. The Stad Ship Tunnel in Norway is shorter, wider, and deeper.