sentences:  Vogtlandbahn has operated the Vogtland-Express since 2005 (except between 15 February 2009 and 8 April 2009) between Plauen and Berlin.With the formation of the Middle Saxony Transport Association ("Verkehrsverbund Mittelsachsen") with Chemnitz as its central hub, Chemnitz Hauptbahnhof has taken on new functions.Work at the station from 2003 to 2005 improved the interface between trams, buses and the station.