tender for carbon brush for hitachi type traction motor confirming to rdso specn.no.elrs/spec/cb/0027- -rev.0.of sept.2003 for carbon brushes for traction motor of electric locomotive and rdso spec. no.elrs/spec/cb/0037 rev-0 for carbon block grades for traction application. . firms manufacturing carbon brushesfrom imported carbon blocks must get the carbon blocks inspected by rites before manufacturing of carbon brushes. as per specn.34392040004 .