supply of psc sleeper, manufacture and supply of pretensioned prestressed concrete ( psc ) bridge straight wider sleepers for 60kg rails as per rdsos drawing no:t-8672 or t-8970 with latest alteration ( upto the date of opening of tender ) and conforming to indian railway standard ( irs ) specification t-39 ( sixth revision mar.2021 ) for pretensioned prestressed concrete ( psc ) sleepers for with up to date amendment ( upto the date of opening of tender ) [ warranty period: 30 months after the date of delivery ] , psc sleepers 60 kg t-2496 [ warranty period: 30 months after the date of delivery ] => limited