From there it runs generally due south through the Kander valley through Frutigen and Kandersteg to the Lötschberg tunnel to Goppenstein.
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Near the intermediate Spiez station, the Lake Thun line has junctions with two further lines owned by the BLS AG; the Spiez–Erlenbach–Zweisimmen line from Zweisimmen and the Lötschberg line to Brig.