supply of rate contract for manufacture and supply of special psc sleepers, manufacture and supply of 60 kg psc sleeper for switch expansion joints ( sej ) conforming to rdsos drg. no.t-4149 with latest alterations. one set consist of 6 nos. of psc sleepers of rdsos drg no. t- 4149& irs specification no. t-39 ( 6th revision march 2021 ) with latest amendments / alterations if any duly loaded into wagons / road vehicles. [ warranty period: 60 months after the date of delivery ] , manufacture and supply of wider prestressed concrete sleeper for level crossing for 60 kg ( uic ) / 60e1 / 52 kg running rail with 52 kg check rail for 25t axle load conforming to rdsos drg. no.t-8969 with latest alterations & irs specification no. t-39 ( 6th revision march 2021 ) with latest amendments / alterations if any duly loaded into wagons / road vehicles [ warranty period: 60 months after the date of delivery ] , manufacture and supply of wider prestressed concrete sleeper for 25t axle load for 60kg ( uic ) / 60e1 / 52 kg running rails with 60kg ( uic ) / 60e1 / 52 kg guard rail for use on ballasted deck bridges conforming to rdsos drg. no.t-8970 with latest alterations& irs specification no. t-39 ( 6th revision march 2021 ) with latest amendments / alterations if any duly loaded into wagons / road vehicles. [ warranty period: 60 months after the date of delivery ] , manufacture and supply of wider prestressed concrete sleeper for 25t axle load for b.g.60kg ( uic ) / 60e1 / 52 kg running rail with 60kg ( uic ) / 60e1 / 52 kg guard rail on bridge approaches conforming to rdsos drg. no.t-8971 to t-8978 with latest alterations& irs specification no. t-39 ( 6th revision march 2021 ) with latest amendments / alterations if any duly loaded into wagons / road vehicles. [ warranty period: 60 months after the date of delivery ] , manufacture and supply of wider prestressed concrete sleeper for sharp curves ( of radius less than 350 m ) for 25t axle load for 60 kg ( uic ) / 60e1 / 52 kg rails conforming to rdsos drg. no. t-8979 to t-8982 with latest alterations& irs specification no. t-39 ( 6th revision march 2021 ) with latest amendments / alterations if any duly loaded into wagons / road vehicles. [ warranty period: 60 months after the date of delivery ]