The Solothurn–Moutier railway line is a 22 kilometre-long standard-gauge line in Switzerland, connecting Solothurn via the Weissenstein Tunnel to Moutier in the Bernese Jura. At the start of operations in 1908, the Emmentalbahn (Emmental Railway) took over operations of the line, which was owned by the Solothurn-Münster-Bahn (Solothurn-Moutier Railway, SMB). In 1997, it merged with the Emmental-Burgdorf-Thun-Bahn (EBT) and the Vereinigte Huttwil-Bahnen (United Huttwil Railways, VHB)—which already worked together for the operation of trains—to form the Regionalverkehr Mittelland (RM), which then took over the operation of the line. Since a merger in 2006, the line has been part of BLS, while passenger services have been operated by the Swiss Federal Railways (SBB) since 2010.