▁the ▁Mer å ker ▁Line ▁to ▁St or li en , ▁south ▁along ▁the ▁D ov re ▁Line ▁to ▁O pp dal ▁and ▁south - east ▁along ▁the ▁R ø ros ▁Line ▁to ▁T yn set . ▁ ▁On ▁ 4 ▁January ▁ 2 0 0 0 , ▁a ▁Class ▁ 9 2 ▁train ▁was ▁dam aged ▁beyond ▁repair ▁in ▁the ▁Å sta ▁accident ▁near ▁Å sta ▁Station ▁on ▁the ▁R ø ros ▁Line . ▁Nin ete en ▁people ▁were ▁killed ▁in ▁the ▁accident . ▁From ▁ 7 ▁January ▁ 2 0 0 1 , ▁N SB ▁made ▁several ▁major ▁changes ▁to ▁the ▁comm uter ▁rail . ▁A ▁fixed , ▁hour ly ▁head way ▁was ▁introduced ▁on ▁the ▁trains ▁from ▁Ste ink jer ▁to ▁Tr ond heim ; ▁including ▁extra ▁r ush - hour ▁trains ▁from ▁L erk end al ▁to ▁St j ø rd al , ▁giving ▁ 2 3 ▁depart ures ▁per ▁day ▁in ▁each ▁direction . ▁South ▁of ▁Tr ond heim , ▁the ▁service ▁was ▁r er out ed ▁to ▁terminate ▁at ▁L erk end al . ▁Part ▁of ▁the ▁reason ▁for ▁the ▁expansion ▁was ▁that ▁the ▁delivery ▁of ▁the ▁new ▁Class ▁ 9 3 ▁trains ▁for ▁regional ▁services ▁fre ed ▁up ▁more ▁Class ▁ 9 2 ▁units . ▁This ▁also ▁allowed ▁N SB ▁to ▁operate ▁some ▁of ▁services ▁with ▁double ▁unit ▁( four - car ) ▁trains ▁in ▁r ush - hour . ▁ ▁From ▁ 2 2 ▁September ▁ 2 0 0 2 , ▁N SB ▁and ▁the