se a ▁Park . ▁ ▁Northern ▁line ▁split ▁T f L ▁has ▁long ▁asp ired ▁to ▁split ▁the ▁Northern ▁line ▁into ▁two ▁separate ▁routes . ▁Running ▁trains ▁between ▁all ▁combinations ▁of ▁branches ▁and ▁the ▁two ▁central ▁sections , ▁as ▁at ▁present , ▁means ▁only ▁ 2 4 ▁trains ▁an ▁hour ▁can ▁run ▁through ▁each ▁of ▁the ▁central ▁sections ▁at ▁peak ▁times , ▁because ▁mer ging ▁trains ▁have ▁to ▁wait ▁for ▁each ▁other ▁at ▁the ▁j unction s ▁at ▁Cam den ▁Town ▁and ▁Ken ning ton . ▁Comple t ely ▁seg reg ating ▁the ▁routes ▁could ▁allow ▁ 3 6 ▁trains ▁an ▁hour ▁on ▁all ▁parts ▁of ▁the ▁line . ▁T f L ▁has ▁already ▁separated ▁the ▁Char ing ▁Cross ▁and ▁Bank ▁branches ▁during ▁off - pe ak ▁periods ; ▁however , ▁four ▁trains ▁per ▁hour ▁still ▁run ▁to ▁and ▁from ▁M orden ▁via ▁Char ing ▁Cross ▁in ▁the ▁peak ; ▁the ▁northern ▁branches ▁to ▁Ed g ware ▁and ▁High ▁Bar net ▁cannot ▁be ▁separated ▁until ▁Cam den ▁Town ▁station ▁is ▁upgrad ed ▁to ▁co pe ▁with ▁the ▁numbers ▁of ▁passengers ▁changing ▁trains . ▁ ▁In ▁ 2 0 0 5 ▁London ▁Under ground ▁failed ▁to ▁secure ▁planning ▁permission ▁for ▁a ▁compreh ensive ▁upgrade ▁plan ▁for ▁Cam den ▁Town ▁t ube ▁station ▁that ▁would ▁have ▁involved ▁demol ition ▁of ▁the ▁existing ▁station ▁entrance ▁and ▁several ▁other ▁surface - level ▁buildings , ▁all ▁within ▁a ▁conservation ▁area . ▁New ▁plans ▁were ▁submitted ▁in ▁ 2 0 1 5 , ▁which ▁avoid ▁the ▁existing ▁station ▁entrance