Gundoin probably intended to link his duchy with the region of the Aar and extend his authority as far as Lake Thun.
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Beatus then ventured south to the mountains above Lake Thun, taking up a hermitage in what is now known as St. Beatus Caves, near the village of Beatenberg, probably in the ninth century.
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.
Today the summit can be reached by the Seilbahnen Beatenberg-Niederhorn, a more modern gondola lift that runs from the village of Beatenberg, where it connects with the Thunersee–Beatenberg Bahn, a funicular with connections to the shipping services on Lake Thun.