agon ▁system ▁was ▁opened ▁here , ▁too ; ▁w agon ▁could ▁be ▁delivered ▁to ▁any ▁point ▁on ▁the ▁whole ▁line . ▁▁ ▁The ▁B iel – T ä uff elen – In s ▁line ▁remained ▁the ▁only ▁line ▁of ▁the ▁Se el änd ische ▁L okal bah nen . ▁▁ ▁The ▁Se el änd ische ▁L okal bah nen ▁was ▁renamed ▁the ▁B iel - T ä uff elen - In s - B ahn ▁( B iel - T ä uff elen - In s ▁Railway , ▁B TI ) ▁as ▁of ▁ 1   Se ptember ▁ 1 9 4 5 . ▁The ▁co operation ▁between ▁the ▁Ober a arg au - J ura ▁railway ▁( O ber a arg au - J ura - B ah nen , ▁O JB ) ▁and ▁the ▁Sol oth urn - N ieder bi pp ▁Railway ▁( Sol oth urn - N ieder bi pp - B ahn , ▁SN B ), ▁which ▁had ▁existed ▁for ▁some ▁time , ▁was ▁reg ulated ▁by ▁contract ▁from ▁ 1 9 6 0 . ▁▁ ▁The ▁new ▁under ground ▁approach ▁of ▁the ▁B iel - T ä uff elen - In s ▁line ▁to ▁B iel / B ienne ▁station ▁was ▁opened ▁on ▁ 2 2   May ▁ 1 9 7 5 . ▁This ▁allowed ▁the ▁dis m ant ling ▁of ▁the ▁line ▁that ▁had ▁run ▁along ▁streets ▁under ▁the ▁large ▁S BB ▁railway ▁bridge ▁to ▁B iel ▁station ▁forec ourt . ▁The ▁under ground ▁station