▁new ▁light weight ▁sub way - e lev ated ▁equipment , ▁a ▁new ▁r ush - hour - only ▁service ▁was ▁inaugur ated ▁from ▁E ighth ▁Avenue ▁and ▁ 1 4 th ▁Street ▁to ▁Le f fer ts ▁Bou lev ard ▁at ▁the ▁east ▁end ▁of ▁the ▁Liber ty ▁Avenue ▁E lev ated ▁( the ▁continu ation ▁of ▁the ▁F ult on ▁Street ▁E lev ated ). ▁The ▁E ighth ▁Avenue – Can ars ie ▁route ▁was ▁given ▁B MT ▁marker ▁ 1 6 , ▁and ▁trains ▁running ▁to ▁Le f fer ts ▁Bou lev ard ▁usually ▁were ▁marked ▁as ▁ 1 3 . ▁When ▁the ▁F ult on ▁Street ▁El ▁was ▁torn ▁down , ▁some ▁r ush - hour ▁Broadway ▁trains ▁ran ▁through ▁from ▁the ▁Broadway ▁E lev ated ▁( J ama ica ▁Line ) ▁to ▁Can ars ie ▁via ▁the ▁fly over ▁at ▁Broadway ▁J unction ; ▁these ▁were ▁marked ▁as ▁ 1 4 . ▁In ▁ 1 9 6 7 , ▁when ▁all ▁B MT ▁services ▁were ▁given ▁letters , ▁the ▁ 1 6 , ▁which ▁used ▁the ▁full ▁Can ars ie ▁Line , ▁was ▁designated ▁as ▁LL . ▁The ▁r ush - hour ▁Broadway ▁service ▁( 1 4 ) ▁was ▁designated ▁J J . ▁The ▁J J ▁ran ▁until ▁ 1 9 6 8 ▁when ▁it ▁was ▁replaced ▁by ▁the ▁K K ▁which ▁stayed ▁on ▁the ▁J ama ica ▁Line ▁instead ▁of ▁switching ▁to ▁the ▁Can ars ie ▁Line ▁at ▁Broadway ▁J unction . ▁The ▁fly over ▁connection ▁has