In 1858 it started to build its Witten–Duisburg trunk line through the Ruhr. The first section was opened between Duisburg and Hochfeld for freight trains only on 19 August 1859. The 52 km line from Bochum-Langendreer to Steele, Essen and Mülheim an der Ruhr, with connections to various coal mines, was completed on 1 May 1862. At Steele it also connected with the northern end of the Steele–Vohwinkel railway, which had been rebuilt in 1847 from the Prince William Railway (opened as the first horse-powered railway in Germany in 1831) and acquired by the BME in 1854 for 1.3 million thalers.