The line from Biel/Bienne via Sonceboz-Sombeval to Moutier was built by the Jura bernois (JB) and was part of the international connection from Bern to Delémont and on to Belfort via Delle or Basel.

Since the opening of the Grenchenberg Tunnel on 1 October 1915, the direct trains from Biel to Delémont have used the shorter and less steep line via Grenchen.

In Tavannes, travellers have the opportunity to switch to the narrow-gauge trains on the line to Noirmont of the Chemins de fer du Jura (CJ).

After crossing the narrow valley of Court, the line reaches Moutier where it meets the newer and shorter connection from Biel under the Grenchenberg plateau.

Today one Regio service runs each hour from Biel via Sonceboz to Moutier and continues on the Solothurn–Moutier railway to Solothurn.