▁w agon - f itted ▁train , ▁since ▁it ▁can ▁cause ▁a ▁" spring ▁effect ". ▁ ▁Cont inu ous , ▁automatic ▁air ▁bra ke , ▁used ▁to ▁bra ke ▁the ▁entire ▁train . ▁ ▁It ▁is ▁a ▁negative - type ▁bra ke ▁and ▁is ▁called ▁continuous ▁because ▁it ▁extends ▁itself ▁through ▁the ▁entire ▁train , ▁automatic ▁because ▁if ▁bra ke ▁continu ity ▁is ▁no ▁longer ▁present ▁( general ▁pipe ▁breaks ), ▁emer gency ▁bra king ▁is ▁automatically ▁applied . ▁ ▁On ▁units ▁with ▁B red a - type ▁val ves ▁and ▁O er lik on ▁le vers ▁the ▁bra kes ▁are ▁gradu able ▁during ▁bra king ▁and ▁re le asing ; ▁the ▁working ▁principles ▁are ▁the ▁following . ▁ ▁The ▁bra king ▁system ▁of ▁the ▁locomot ive ▁is ▁formed ▁by ▁an ▁array ▁of ▁components : ▁ ▁Two ▁kind ▁of ▁t anks , ▁called ▁" aux ili ary ▁res er voir " ▁( ser b ato io ▁aus ili ario ) ▁and ▁" command ▁res er voir " ▁( ). ▁ ▁One ▁or ▁two ▁pip es , ▁running ▁along ▁the ▁train , ▁called ▁" main ▁pipe " ▁( , ▁not ▁on ▁every ▁E 6 3 6 ▁and ▁generally ▁only ▁on ▁passenger ▁stock , ▁fre ight ▁cars ▁don ' t ▁have ▁it ) ▁and ▁" general ▁pipe " ▁( , ▁the ▁actual ▁bra ke ▁pipe ). ▁ ▁A ▁tap ▁( the ▁controller ▁which ▁is ▁used ▁to ▁gradu ate ▁bra king ). ▁ ▁A ▁particular ▁device ▁called ▁"", ▁which ▁is ▁ ▁divided ▁into ▁two ▁ch