Arlberg Tunnels are two tunnels–one a railway tunnel and the other for automobile traffic–in western Austria between the provinces of Vorarlberg and Tyrol. The tunnels run through Arlberg Mountain at the northeastern end of the Rhaetian Alps. The railway tunnel is about 6 miles (10 kilometers) long and is an important link in the Paris-to-Vienna line. It opened in 1884 and was electrified in 1923. The road tunnel is nearly 9 miles (14 kilometers) long and opened in 1978.
