, ▁if ▁the ▁controller ▁is ▁left ▁for ▁too ▁much ▁time ▁in ▁the ▁over load ▁position , ▁it ▁may ▁reach ▁a ▁very ▁high ▁pressure ▁( even ▁). ▁ ▁It ▁is ▁very ▁easy ▁for ▁the ▁bra kes ▁to ▁remain ▁in ▁effect ▁in ▁this ▁case , ▁and ▁the ▁only ▁pract ic able ▁solution ▁is ▁to ▁manually ▁empty ▁the ▁command ▁res er voir ▁t anks ▁as ▁said ▁above . ▁ ▁Mechan ical ▁modifications ▁▁ ▁The ▁locomot ive ▁is ▁formed ▁by ▁two ▁half ▁car b od ies , ▁pivot ing ▁over ▁the ▁central ▁bog ie . ▁Between ▁them , ▁there ▁is ▁a ▁bell ows , ▁which ▁was ▁originally ▁made ▁with ▁rub ber ▁then ▁replaced ▁in ▁the ▁ 1 9 5 0 s ▁by ▁an ▁imper me able ▁memb rane . ▁In ▁recent ▁years ▁this ▁was ▁further ▁replaced ▁by ▁flexible ▁pl astic ▁material . ▁ ▁On ▁post ▁war ▁units , ▁ ▁rein for cement ▁frames ▁have ▁been ▁introduced ▁on ▁the ▁ch ass is ▁and ▁under ▁the ▁c abs , ▁as ▁the ▁first ▁ 1 0 8 ▁units ▁showed ▁some ▁mechanical ▁weak ness es ▁in ▁those ▁points ; ▁ ▁in ▁the ▁mid - 1 9 8 0 s ▁it ▁was ▁decided ▁to ▁rein force ▁only ▁the ▁ch ass is ▁on ▁pre - war ▁units ▁( how ever ▁units ▁ 0 2 6 ▁an ▁ 0 6 5 ▁never ▁received ▁these ▁modifications ). ▁ ▁To ▁reduce ▁par as ite ▁motion , ▁d amp ers ▁were ▁mounted ▁between ▁the ▁car b od ies : ▁g ly cer ine - type ▁from ▁units