▁was ▁opened ▁in ▁ 1 9 7 6 , ▁when ▁the ▁Northern ▁City ▁Line ▁became ▁part ▁of ▁British ▁Rail . ▁ ▁Rec ent ▁develop ments ▁In ▁ 1 9 7 5 , ▁the ▁Northern ▁City ▁Line , ▁known ▁by ▁that ▁time ▁as ▁the ▁High bury ▁branch , ▁was ▁transferred ▁from ▁London ▁Under ground ▁to ▁British ▁Rail ; ▁it ▁is ▁now ▁served ▁by ▁Great ▁Northern . ▁In ▁the ▁past , ▁before ▁the ▁introduction ▁of ▁the ▁ 1 9 9 5 ▁stock , ▁the ▁Northern ▁line ▁was ▁sometimes ▁nick named ▁the ▁" M is ery ▁Line " ▁in ▁the ▁press ▁because ▁of ▁its ▁perce ived ▁un re li ability . ▁ ▁In ▁ 2 0 0 3 , ▁a ▁train ▁der a iled ▁at ▁Cam den ▁Town . ▁Although ▁no ▁one ▁was ▁hurt , ▁points , ▁signals ▁and ▁carri ages ▁were ▁dam aged , ▁and ▁the ▁j unction s ▁there ▁were ▁not ▁used ▁while ▁rep airs ▁were ▁under ▁way : ▁all ▁trains ▁from ▁the ▁Ed g ware ▁branch ▁were ▁rout ed ▁over ▁the ▁Bank ▁branch , ▁and ▁trains ▁from ▁the ▁High ▁Bar net ▁and ▁Mill ▁Hill ▁East ▁branch ▁were ▁rout ed ▁over ▁the ▁Char ing ▁Cross ▁branch . ▁This ▁situation ▁was ▁resolved ▁when ▁the ▁j unction s ▁re open ed , ▁after ▁much ▁repair ▁work ▁and ▁safety ▁analysis ▁and ▁testing ▁by ▁contract or , ▁on ▁ 7 ▁March ▁ 2 0 0 4 . ▁A ▁joint ▁report ▁by ▁the ▁Under ground ▁and ▁its ▁maintenance ▁contract or ▁T ube ▁L ines ▁concluded ▁that ▁poor ▁track ▁geometry