The Hessian Ludwig Railway (Hessische Ludwigsbahn) received the concession for the Odenwald Railway in the summer of 1868 and financed its construction by raising public debt of over 4 million thalers. It was constructed as a single-track main-line railway of standard gauge, crossing the Odenwald in southern Hesse and northern Baden-Württemberg. In September 1868, construction began on the 1,205 m long tunnel near Frau-Nauses between Wiebelbach and Höchst im Odenwald in the Mümling valley. This cost the life of eleven people and was finished at the Christmas of 1870. In Darmstadt, work began on 1 February 1869 and progressed quickly towards Reinheim. The line was opened to Ober-Ramstadt on 28 December 1870, to Reinheim on 15 May 1871 and to Wiebelbach-Heubach two months later. On 23 December 1871 the section to Erbach was opened, having been delayed by a collapse in the Frau-Nauses tunnel.