Besides the lines mentioned above, the Bern-Lötschberg-Simplon railway also operated several other independently owned operating companies in the canton of Bern, including the Bern-Neuchâtel railway (BN), the Gürbetal-Bern-Schwarzenburg railway (GBS) and the Spiez-Erlenbach-Zweisimmen railway (SEZ). In 1997, the ownership of these lines was taken over by the Bern-Lötschberg-Simplon railway.