. ▁The ▁met re ▁gauge ▁terminal ▁platforms , ▁and ▁the ▁first ▁section ▁of ▁the ▁line , ▁are ▁shared ▁with ▁trains ▁of ▁the ▁Lu z ern – St ans – Eng el berg ▁line . ▁Short ly ▁after ▁leaving ▁the ▁station , ▁the ▁line ▁enters ▁a ▁tunnel ▁under ▁Luc erne ' s ▁southern ▁sub ur bs ▁as ▁far ▁as ▁K ri ens ▁Mat ten hof ▁station . ▁From ▁here ▁the ▁line ▁runs ▁on ▁the ▁surface ▁to ▁Her g is w il , ▁where ▁the ▁Lu z ern – St ans – Eng el berg ▁line ▁diver ges . ▁ ▁From ▁Her g is w il ▁station ▁the ▁Br ün ig ▁line ▁runs ▁through ▁the ▁Lo pper ▁I ▁tunnel , ▁under ▁a ▁shoulder ▁of ▁Mount ▁Pil atus , ▁to ▁Al pn ach stad , ▁which ▁is ▁the ▁starting ▁point ▁of ▁the ▁Pil atus ▁Railway . ▁The ▁two ▁lines ▁are ▁of ▁different ▁gau ges , ▁and ▁there ▁is ▁no ▁track ▁connection . ▁From ▁Al pn ach stad ▁station , ▁the ▁Br ün ig ▁ ▁line ▁follows ▁the ▁Sar ner ▁A a ▁and ▁Lake ▁S arn en ▁to ▁G is w il . ▁Bey ond ▁G is w il ▁station , ▁the ▁line ' s ▁first ▁ra ck ▁section ▁then ▁allows ▁the ▁line ▁to ▁clim b ▁to ▁Kais erst u hl ▁station . ▁From ▁here , ▁the ▁runs ▁through ▁the ▁upper ▁bas in ▁of ▁the ▁Sar ner ▁A a ▁and ▁alongside ▁Lake ▁L ung ern ▁as ▁far ▁as ▁L ung ern . ▁This ▁is ▁the ▁ste ep