cont in ued ; ▁however , ▁starting ▁from ▁the ▁ 1 9 7 0 s , ▁many ▁( not ▁all ) ▁units ▁received ▁" R ip et izione ▁Seg n ali ▁a ▁ 4 ▁cod ici " ▁system , ▁Has ler ▁speed ometer ▁and ▁a ▁modified ▁" speed ▁graph ▁rec order " ▁( Z ona ▁t ach ig raf ica ), ▁that ▁also ▁recorded ▁the ▁codes ▁received ▁from ▁the ▁R S . ▁ ▁Special ▁and ▁experimental ▁units ▁▁ ▁E . 6 3 6 . 3 8 5 ▁was ▁part ▁of ▁the ▁" P V ▁Train " ▁project ▁and ▁received ▁phot ov olta ic ▁cells ▁used ▁to ▁re charge ▁the ▁ 2 4   V ▁batter ies . ▁Due ▁to ▁this , ▁it ▁has ▁been ▁inserted ▁in ▁the ▁asset ▁of ▁Italian ▁historical ▁units ; ▁ ▁E . 6 3 6 . 0 8 2 ▁has ▁been ▁used ▁for ▁testing ▁in ▁ 1 9 6 5 ▁of ▁r he ost atic ▁bra king ▁( the ▁same ▁system ▁was ▁later ▁adopted ▁on ▁F S ▁Class ▁E . 4 4 4 ); ▁a ▁second , ▁smaller ▁lever ▁was ▁mounted ▁on ▁the ▁top ▁of ▁the ▁tra ction ▁lever , ▁and ▁was ▁used ▁to ▁control ▁the ▁bra king ▁r he ost at . ▁This ▁units ▁also ▁mounted ▁more ▁and ▁bigger ▁v ents ▁on ▁its ▁sides . ▁At ▁this ▁time , ▁it ▁has ▁been ▁stri pped ▁of ▁many ▁internal ▁components , ▁and ▁is ▁not ▁able ▁to ▁run . ▁ ▁E . 6 3 6 . 2 8 4 ▁is ▁maybe