Royal Württemberg State Railways
…trains ran on the Upper Danube line from Rottweil to Tuttlingen, from where in 1870 the connexion to Immendingen on the Black Forest line was built. The Danube Valley line was built in 1868 from Ulm in the direction of Blaubeuren-Riedlingen, but only reached Sigmaringen in 1873. It was another six years before the Zollernalb…