supply of rate contract for manufacture and supply of pretensioned prestressed concrete (psc) bridge straight wider sleepers for 60kg rails as per rdsos drawing no: t-8970rate contract for manufacture and supply of pretensioned prestressed concrete (psc) bridge straight wider sleepers for 60kg rails as per rdsos drawing no: t-8970,rate contract for manufacture and supply of pretensioned prestressed concrete (psc) bridge str aight wider sleepers for 60kg rails as per rdsos drawing no: t-8970 with latest alteration (upto the date of o pening of tender) and conforming to indian railway standard (irs) specification t-39 (sixth revision mar.2021 ) for pretensioned prestressed concrete (psc) sleepers with up to date of amendment (up to the date of openi ng of tender) [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]