The Langenthal-Jura Railway was a former railway company in Switzerland. It merged in 1958 with the Langenthal–Melchnau-Bahn to form Oberaargau-Jura Railways, which then operated the then still 11 km-long, metre-gauge LJB line from Langenthal to Niederbipp. After further mergers, the Langenthal–Oensingen railway line has been part of the Aare Seeland mobil (ASm) since 1999.

The Aare Seeland mobil AG based in Langenthal is a transport company in Switzerland. It was created in 1999 from the merger of Oberaargau Regional Transport, the Solothurn-Niederbipp Railway, the Biel-Täuffelen-Ins Railway and the Oberaargauische Automobilkurse.