▁and ▁the ▁conservation ▁area ▁by ▁building ▁a ▁second ▁entrance ▁and ▁inter change ▁t unn els ▁to ▁the ▁north , ▁mostly ▁on ▁the ▁site ▁of ▁a ▁subsequently ▁vac ated ▁Inf ant ▁school . ▁If ▁the ▁appro val ▁is ▁given , ▁the ▁upgrad ing ▁work ▁is ▁expected ▁to ▁begin ▁in ▁ 2 0 2 0 ▁and ▁complete ▁in ▁ 2 0 2 4 . ▁ ▁In ▁popular ▁culture ▁ ▁In ▁his ▁debut ▁novel ▁Ghost written , ▁David ▁Mitchell ▁character ises ▁the ▁Northern ▁line ▁as ▁" the ▁ps y cho ▁of ▁the ▁family ". ▁ ▁The ▁B loc ▁Party ▁song ▁" Wait ing ▁For ▁the ▁ 7 . 1 8 " ▁references ▁the ▁Northern ▁line ▁as ▁" the ▁loud est ". ▁ ▁As ▁part ▁of ▁a ▁series ▁of ▁twelve ▁books ▁tied ▁to ▁the ▁twelve ▁lines ▁of ▁the ▁London ▁Under ground , ▁A ▁Northern ▁Line ▁Min ute ▁focus es ▁on ▁the ▁Northern ▁line . ▁ ▁The ▁Nick ▁Dra ke ▁song ▁" Par as ite " ▁references ▁the ▁Northern ▁Line . ▁ ▁The ▁ 1 9 8 2 ▁Rob yn ▁H itch cock ▁song ▁" F if ty ▁Two ▁St ations " ▁begins , ▁" There ' s ▁fifty - two ▁stations ▁on ▁the ▁Northern ▁Line / None ▁of ▁them ▁is ▁yours , ▁one ▁of ▁them ▁is ▁mine ." ▁ ▁See ▁also ▁ ▁Les lie ▁Green , ▁architect ▁of ▁the ▁Char ing ▁Cross , ▁E ust on ▁and ▁H amp st ead ▁Railway ' s ▁early ▁stations ▁ ▁T . ▁P . ▁Fig g is , ▁architect ▁of