The Arth-Rigi Railway (Arth-Rigi-Bahn; ARB) is a Swiss standard gauge rack railway that runs from Arth-Goldau to Rigi. It has been merged with the Vitznau-Rigi Railway (Vitznau-Rigi-Bahn; VRB), which climbs the mountain from the other side, to form the Rigi Railways (Rigi-Bahnen; RB) company.