▁scheme , ▁similar ▁to ▁ 2 7 ▁select ▁R 2 7 s ▁and ▁other ▁Red bird ▁trains ▁in ▁the ▁sub way ▁system , ▁as ▁part ▁of ▁the ▁C lean ▁Car ▁Program . ▁ ▁Ret irement ▁The ▁WH - power ed ▁R 3 0 s , ▁which ▁were ▁not ▁re built , ▁were ▁replaced ▁by ▁the ▁R 6 8 As ▁and ▁the ▁re built ▁R 3 0 s , ▁which ▁were ▁transferred ▁from ▁the ▁B MT ▁Eastern ▁Division . ▁The ▁last ▁un re built ▁train ▁ran ▁on ▁December ▁ 1 4 , ▁ 1 9 9 0 . ▁ ▁The ▁over h au led ▁R 3 0 s ▁and ▁the ▁R 3 0 As ▁were ▁planned ▁to ▁run ▁until ▁ 1 9 9 7 . ▁However , ▁the ▁cars ▁were ▁prem ature ly ▁ph ased ▁out ▁starting ▁in ▁ 1 9 9 2 ▁as ▁the ▁Trans it ▁Author ity ▁de emed ▁them ▁too ▁difficult ▁to ▁upgrade ▁with ▁air - condition ing ; ▁installation ▁would ▁have ▁been ▁cost ly ▁and ▁would ▁have ▁added ▁too ▁much ▁weight ▁to ▁the ▁cars . ▁Additionally , ▁at ▁the ▁time , ▁rid ership ▁was ▁decl ining ▁on ▁the ▁sub way , ▁which ▁created ▁an ▁excess ively ▁large ▁sur plus ▁of ▁sub way ▁cars . ▁On ▁ ▁May ▁ 3 0 , ▁ 1 9 9 3 , ▁the ▁Electric ▁Rail road ers ▁Association ▁spons ored ▁a ▁F are well ▁to ▁the ▁R 3 0 ▁fan ▁trip . ▁The ▁last ▁of ▁the ▁over h au led ▁R 3 0 s ▁were