The Vitznau-Rigi-Bahn in Switzerland, which opened on May 21, 1871, is the oldest mountain cog (rack) railway in Europe. It was designed by the legendary engineer Niklaus Riggenbach, who utilized a "rack and pinion" system to allow trains to climb the steep 25% gradients of Mount Rigi. In 2026, this railway remains a marvel of Victorian engineering, still utilizing its original route from the shores of Lake Lucerne to the summit at Rigi Kulm. While the world's absolute oldest cog railway is the Mount Washington Cog Railway in the USA (1868), the Rigi Bahn was the first to bring this technology to the Alps, sparking a "golden age" of mountain tourism. For 2026 visitors, the railway even operates a historic steam locomotive (LOK 7) from 1873 on special occasions, allowing passengers to experience the exact same "vertical climb" that royal families and early explorers enjoyed over 150 years ago.