The Stuttgart–Horb railway is a 67.227 kilometer-long railway in the southern part of the state of Baden-Württemberg in Germany, running from Stuttgart to Horb. It forms part of a railway known as the Gäubahn (IPA: [ˈɡɔɪbaːn]) or Gäu Railway. The Royal Württemberg State Railways (Königlich Württembergischen Staats-Eisenbahnen or K.W.St.E.) and the Baden State Railways (Badische Staatseisenbahnen) constructed the majority of this line between the years 1866 and 1879. Today the partially single-track, fully electrified line features the high-speed Intercity-Express (ICE) service, with its tilting train technology, traveling from Stuttgart to Zürich. In addition, a multitude of local train services of numerous railway companies are on offer. The Gäu Railway is also a significant line in the North-South freight service system.