▁of ▁the ▁ 1 4 th ▁Street ▁T unnel , ▁which ▁the ▁line ▁uses ▁to ▁cross ▁the ▁East ▁River . ▁ ▁Ext ent ▁and ▁service ▁ ▁Services ▁that ▁use ▁the ▁Can ars ie ▁Line ▁are ▁colored ▁. ▁The ▁following ▁service ▁uses ▁all ▁of ▁the ▁Can ars ie ▁Line : ▁ ▁The ▁Can ars ie ▁Line ▁runs ▁from ▁E ighth ▁Avenue ▁and ▁ 1 4 th ▁Street ▁in ▁Manh attan ▁to ▁Rock away ▁Park way ▁in ▁Can ars ie , ▁Brook lyn . ▁It ▁is ▁double - track ed ▁along ▁its ▁entire ▁length , ▁except ▁for ▁short ▁st ret ches ▁of ▁lay up ▁track ▁in ▁Manh attan ▁and ▁Brook lyn . ▁ ▁The ▁current ▁line ▁is ▁a ▁two - track ▁sub way ▁from ▁its ▁Manh attan ▁terminal ▁to ▁Broadway ▁J unction ▁in ▁the ▁East ▁New ▁York ▁section ▁of ▁Brook lyn , ▁with ▁the ▁exception ▁of ▁a ▁short ▁stretch ▁at ▁Wilson ▁Avenue ▁where ▁it ▁is ▁a ▁double - deck ed ▁structure ▁with ▁the ▁south bound ▁track ▁out do ors ▁directly ▁above ▁the ▁ind oor , ▁ground - level ▁north bound ▁track . ▁Although ▁the ▁north bound ▁track ▁appears ▁to ▁be ▁under ground , ▁it ▁is ▁in ▁fact ▁out do ors ▁at ▁ground - level ▁for ▁there ▁are ▁no ▁st airs ▁leading ▁from ▁the ▁north bound ▁platform ▁to ▁the ▁station ▁entrance ▁at ▁the ▁dead - end ▁of ▁Wilson ▁Avenue , ▁sout heast ▁of ▁M off at ▁Street . ▁This ▁is ▁due ▁to ▁the ▁line ▁being ▁pressed ▁directly ▁against ▁the ▁New ▁York ▁Connect ing ▁Rail road ,