▁of ▁the ▁locomot ive . ▁The ▁diameter ▁of ▁the ▁big ▁g ear w heel ▁was ▁limited ▁by ▁the ▁loading ▁gauge , ▁therefore ▁the ▁c og ▁transmission ▁had ▁to ▁be ▁cas c aded ▁in ▁two ▁steps ▁because ▁the ▁engine ▁speed ▁of ▁all ▁four ▁mot ors ▁was ▁identical . ▁Side ▁ 2 ▁contained ▁single ▁side - mount ed ▁Buch li ▁drives . ▁Due ▁to ▁the ▁great ▁weight ▁of ▁those ▁drives ▁they ▁were ▁mounted ▁trans vers ally . ▁The ▁installation ▁of ▁the ▁drive ▁on ▁both ▁sides ▁– ▁as ▁was ▁used ▁on ▁the ▁Be ▁ 2 / 5 ▁– ▁was ▁not ▁considered ▁necessary ▁any ▁more . ▁ ▁The ▁bra ke ▁equipment ▁of ▁the ▁locomot ive ▁was : ▁ ▁drive ▁whe els ▁with ▁bra kes ▁on ▁both ▁sides ▁ ▁inner ▁idle ▁whe els ▁single - side ▁bra ked ▁ ▁outer ▁idle ▁whe els ▁non - bra ked ▁ ▁one ▁bra king ▁rod ▁for ▁each ▁locomot ive ▁frame ▁ ▁automatic ▁air ▁bra ke ▁with ▁single ▁re le asing ▁bra ke ▁val ves ▁of ▁the ▁West ing house ▁type . ▁ ▁direct ▁working ▁through ▁bra ke ▁ ▁hand bra ke ▁from ▁both ▁c abs ▁to ▁the ▁respective ▁part ▁of ▁the ▁locomot ive ▁ ▁elect rical ▁bra ke ▁( see ▁the ▁next ▁section ) ▁ ▁The ▁A e ▁ 4 / 8 ▁never ▁had ▁divided ▁bra ke ▁sho es ▁or ▁automatic ▁bra king ▁rod ▁adjust ment ▁ ▁The ▁locomot ive ' s ▁total ▁weight ▁of ▁ ▁– ▁coinc ident ally , ▁the ▁same ▁as ▁the ▁later ▁A e ▁ 4 /