▁right - of - way ▁ran ▁between ▁East ▁ 9 5 th ▁and ▁East ▁ 9 6 th ▁Stre ets ▁as ▁far ▁south ▁as ▁Se av iew ▁Avenue . ▁Some ▁t rol ley ▁pol es ▁from ▁the ▁line ▁still ▁exist , ▁but ▁the ▁line ' s ▁right - of - way ▁was ▁destroyed ▁by ▁develop ments ▁in ▁the ▁area . ▁ ▁By ▁the ▁ 1 9 8 0 s , ▁the ▁Can ars ie ▁Line ▁was ▁proposed ▁for ▁closure , ▁as ▁it ▁was ▁dil ap id ated ▁and ▁only ▁had ▁a ▁rid ership ▁of ▁ 4 0 , 0 0 0 ▁a ▁day . ▁ ▁Early ▁ 2 1 st ▁century ▁up gr ades ▁ ▁Autom ation ▁and ▁post - autom ation ▁▁ ▁The ▁Can ars ie ▁Line ▁is ▁one ▁of ▁only ▁two ▁New ▁York ▁City ▁non - sh utt le ▁sub way ▁lines ▁that ▁hosts ▁only ▁a ▁single ▁service ▁and ▁does ▁not ▁share ▁operating ▁track age ▁with ▁any ▁other ▁line ▁or ▁service ; ▁the ▁other ▁is ▁the ▁I RT ▁Fl ushing ▁Line , ▁carrying ▁the ▁. ▁Because ▁of ▁this , ▁it ▁was ▁chosen ▁as ▁the ▁location ▁of ▁the ▁first ▁fully ▁autom ated ▁line ▁of ▁the ▁New ▁York ▁City ▁Sub way . ▁The ▁autom ation ▁project ▁was ▁among ▁the ▁first ▁in ▁the ▁world ▁to ▁use ▁a ▁radio ▁frequency - based ▁system . ▁The ▁plans ▁for ▁installation ▁were ▁laid ▁out ▁between ▁ 1 9 9 9 ▁and ▁ 2 0 0 2 . ▁Communic ations - based ▁train ▁control ▁( CB TC ) ▁was