The Saxon Steam Railway Company (Sächsische Dampfeisenbahngesellschaft mbH or SDG), formerly the BVO Bahn, is a German railway company in Saxony, that operates several Saxon narrow gauge railways. The SDG is a subsidiary of the BVO Verkehrsbetriebe Erzgebirge (BVO) and the Verkehrsverbund Oberelbe (VVO). From Wikipedia
