supply of erv (apm) for escorts design bmbs. drawing no. : escorts drg. no. 3eb7346.erv (apm) for escorts design bmbs. drawing no. : escorts drg. no. 3eb7346.,erv (apm) for escorts design bmbs. drawing no. : escorts drg. no. 3eb7346. material and specification : as per operation and maintenance manual of escorts make bmbs for freight stock with casnub bogie; doc. no. red-rd-bs-019-om-01; rdso,s spec. no. wd-23-bmbs-2008 (rev. 1) ame ndment 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 ] ] => limited