sentences:  The Bergisch-Märkische Railway Company ("Bergisch-Märkische Eisenbahn-Gesellschaft", BME), opened its Elberfeld–Dortmund railway from its Elberfeld station (known as Döppersberg station) via Hagen to Dortmund to Schwelm on 9 October 1847.It was extended to Hagen and Dortmund on 20 December 1848.The BME took over the DEE in 1857.