▁installed ▁in ▁pieces ▁between ▁ 2 0 0 3 ▁and ▁January ▁ 2 0 0 6 : ▁the ▁elev ated ▁section ▁of ▁the ▁line ▁south ▁of ▁Broadway ▁J unction ▁was ▁completed ▁first , ▁followed ▁by ▁the ▁under ground ▁section ▁north ▁of ▁Broadway ▁J unction . ▁The ▁project ▁cost ▁$ 3 4 0 ▁million , ▁with ▁$ 7 8 ▁million ▁of ▁it ▁used ▁to ▁upgrade ▁track ▁inter lock ings ▁on ▁the ▁line . ▁ ▁In ▁spring ▁ 2 0 0 5 , ▁the ▁current ▁C B TC - enabled ▁R 1 4 3 - class ▁equipment ▁was ▁expected ▁to ▁run ▁under ▁full ▁autom ation ▁with ▁a ▁single ▁operator ▁( known ▁as ▁OP TO , ▁or ▁One ▁Person ▁Train ▁Operation ) ▁acting ▁as ▁an ▁att endant ▁to ▁monitor ▁the ▁train ' s ▁operation ▁and ▁take ▁over ▁manual ▁operation ▁if ▁necessary . ▁However , ▁technical ▁m ish aps ▁including ▁the ▁test ▁train ▁rolling ▁away ▁by ▁itself ▁delayed ▁the ▁start ▁of ▁automatic ▁train ▁operation . ▁The ▁project ▁caused ▁numerous ▁service ▁dis ru ptions ▁on ▁the ▁L ▁at ▁night ▁and ▁on ▁week ends . ▁Fre qu ently , ▁service ▁was ▁shut ▁down ▁in ▁separate ▁sections ▁of ▁the ▁line , ▁usually ▁from ▁E ighth ▁Avenue ▁to ▁Lor imer ▁Street , ▁Lor imer ▁to ▁Broadway ▁J unction , ▁or ▁Broadway ▁J unction ▁to ▁Rock away ▁Park way . ▁During ▁this ▁time , ▁sh utt le ▁bus es ▁served ▁susp ended ▁areas . ▁This ▁project ▁also ▁required ▁the ▁temporary ▁closing ▁of ▁some ▁stations , ▁either ▁in ▁one ▁direction ▁or ▁both ▁directions