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.