Cooperation was planned from the very beginning, so LMB not only selected the same electrification system, but also contracted all operations to the Langenthal-Jura Railway.

The SNB also sought contact with the LJB and entered into an operating contract, adopted the electrification system of the Langenthal-Jura Railway and ran individual trains to Oensingen.

Although it had a longer travel time, due to its poorer routing as a tramway, it offered a much better timetable than the SBB then operated for regional traffic.

The route also allowed somewhat more connections from Oensingen and more services for the workforce of the companies in the Balsthal industrial district of Klus (including Von Roll) to be provided by the Langenthal-Jura Railway or from 1918 by the SNB; Klus itself has been served since 1899 by the standard gauge Oensingen—Balsthal railway (Oensingen-Balsthal-Bahn, OeBB).

This had long since become rundown and unprofitable as a result of competition with the SBB, it had been relocated on state roads, it had fallen into a poor condition due to a lack of maintenance and it also had the political disadvantage of running to another canton.

Thus on 9 May 1943 operations stopped and the tracks were dismantled immediately—iron and copper were sought-after raw materials in the war years and the company needed the additional income.

The SNB, which was opened on 9 January 1918, included another transporter wagon yard, located in Niederbipp, which was also used by the LJB.