▁ 1 - 2 7 6 ▁and ▁special - o il ▁type ▁from ▁unit ▁ 2 7 7 ▁on wards , ▁although ▁these ▁were ▁later ▁elimin ated ▁in ▁ 1 9 7 7 ▁because ▁considered ▁useless . ▁ ▁The ▁first ▁ 1 0 8 ▁units ▁had ▁different ▁r he ost at ▁vent ilation ▁sh aft s ▁on ▁the ▁roof ▁than ▁the ▁rest ▁of ▁the ▁units ▁ones , ▁although ▁these ▁were ▁later ▁replaced ▁with ▁the ▁more ▁efficient ▁sh aft s ▁used ▁on ▁the ▁latter ▁units . ▁ ▁They ▁also ▁had ▁sl iding ▁oil - bu ck les , ▁while ▁following ▁units ▁had ▁rolling ▁bearing ▁ones . ▁ ▁Units ▁ 1 6 2 - 1 7 1 ▁were ▁equ ipped ▁with ▁French - der ived ▁A ther mos ▁bu ck les ▁for ▁testing ▁purposes , ▁which ▁were ▁later ▁removed . ▁ ▁Sand throw ers ▁were ▁mounted ▁internally ▁into ▁the ▁bog ie ▁in ▁the ▁units ▁ 0 0 1 ▁- ▁ 1 0 8 ; ▁after ▁the ▁war ▁they ▁were ▁replaced ▁by ▁external ▁ones ▁that ▁also ▁were ▁n atively ▁mounted ▁on ▁later ▁units . ▁ ▁Saf ety ▁systems ▁▁ ▁The ▁first ▁ 1 0 8 ▁locomot ives ▁originally ▁had ▁mounted ▁a ▁vig il ance ▁ped al ▁designed ▁by ▁F S ▁engineer ▁Min ucci ani , ▁that ▁required ▁a ▁periodic ▁acknowled g ement ▁from ▁the ▁driver ▁when ▁the ▁train ▁was ▁moving ▁( or ▁emer gency ▁bra king ▁would ▁have ▁been ▁commanded ), ▁but ▁after ▁the ▁war , ▁due ▁to ▁labor ▁union ▁press ures , ▁it ▁was ▁dis