Aargau Southern Railway
During the construction of the Heitersberg Line ( opened in 1975 ) , the Rupperswil–Lenzburg–Othmarsingen section was significantly upgraded so that it could be used by most east-west trains between Zurich and Bern . 
<triplet> Heitersberg Line <subj> 1975 <obj> inception <triplet> Rupperswil <subj> Lenzburg <obj> shares border with <triplet> Lenzburg <subj> Rupperswil <obj> shares border with <subj> Othmarsingen <obj> shares border with <triplet> Othmarsingen <subj> Lenzburg <obj> shares border with