supply of secondary brake beam assembly for escorts design bmbs.secondary brake beam assembly for escorts design bmbs.,secondary brake beam assembly for escorts design bmbs. drawing no. : escorts drg. no. 3eb5522, alt. 9 material and specification : as per operation and maintenance manual of escorts m ake bmbs for freight stock with casnub bogie; doc. no. red- rd-bs-019-om-01 ; rdsos spec no. wd- 23-bmbs-2008 (rev. 1) amendment no.1 of sept 2016. [ warranty period: 36 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]