Arlberg

tunnel, at the northern end of the Rhaetian Alps, in western Austria. The pass (at 5,882 feet [1,793 m]) forms a divide between the Danube and Rhine river systems. The region is a noted winter sports area, and the Arlberg technique in skiing was perfected…

…Alpine railroad tunnel built, the Arlberg (Austria-Switzerland), and it proved a great success. Commissioned to drive the 20-km (12.5-mile) Simplon Tunnel (Italy-Switzerland), Brandt produced a novel plan to combat the high temperatures resulting from the tunnel depth—two galleries (separate tunnel headings parallel to each other), connected by crosshatches, providing ventilation…