ended ▁on ▁this ▁branch . ▁All ▁passenger ▁trains ▁were ▁di vert ed ▁via ▁the ▁Bank ▁branch , ▁with ▁several ▁not ▁stopping ▁at ▁stations ▁until ▁they ▁were ▁safely ▁on ▁the ▁Bank ▁branch . ▁ ▁The ▁Northern ▁line ▁was ▁originally ▁scheduled ▁to ▁switch ▁to ▁automatic ▁train ▁operation ▁in ▁ 2 0 1 2 , ▁using ▁the ▁same ▁Sel T rac ▁S 4 0 ▁system ▁as ▁used ▁since ▁ 2 0 0 9 ▁on ▁the ▁J ub ile e ▁line ▁and ▁for ▁a ▁number ▁of ▁years ▁on ▁the ▁D ock lands ▁Light ▁Railway . ▁Origin ally ▁the ▁work ▁was ▁to ▁follow ▁on ▁from ▁the ▁J ub ile e ▁line ▁so ▁as ▁to ▁benefit ▁from ▁the ▁experience ▁of ▁installing ▁it ▁there , ▁but ▁that ▁project ▁was ▁not ▁completed ▁until ▁spring ▁ 2 0 1 1 . ▁Work ▁on ▁the ▁Northern ▁line ▁was ▁contract ed ▁to ▁be ▁completed ▁before ▁the ▁ 2 0 1 2 ▁Olympics . ▁It ▁is ▁now ▁being ▁undert aken ▁in - house , ▁and ▁T f L ▁predicted ▁the ▁upgrade ▁would ▁be ▁complete ▁by ▁the ▁end ▁of ▁ 2 0 1 4 . ▁The ▁first ▁section ▁of ▁the ▁line ▁( West ▁Fin ch ley ▁to ▁High ▁Bar net ) ▁was ▁transferred ▁to ▁the ▁new ▁sign alling ▁system ▁on ▁ 2 6 ▁February ▁ 2 0 1 3 ▁and ▁the ▁line ▁became ▁fully ▁autom ated ▁on ▁ 1 ▁June ▁ 2 0 1 4 ▁with ▁the ▁Ch alk ▁Farm ▁to ▁Ed g ware ▁via ▁Gold ers ▁Green ▁section ▁being ▁the ▁last ▁part ▁of ▁the ▁line