supply of manufacture and supply of prestressed concrete sleeper for thick web switch expansion joint (twsej) conforming to rdso drg. no. t-8838 for 60kg (uic)/r-260 rail. this is a safety item.manufacture and supply of prestressed concrete sleeper for thick web switch expansion joint (twsej) conforming to rdso drg. no. t-8838 for 60kg (uic)/r-260 rail. this is a safety item.,manufacture and supply of prestressed concrete sleeper for thick web switch expansi on joint (twsej) conforming to rdso drg. no. t-8838 for 60kg (uic)/r-260 rail. this is a safety item. specification: irs specification for pretensioned prestressed concrete sleepers t-39-2021(6th revisio n march-2021). [ warranty period: 60 months after the date of delivery ] ] dsd-ctc, ecor odisha 3058.00 numbers dy.ce.c.wat, ecor andhra pradesh 330.00 numbers os(s)doub/bbs, ecor odisha 200.00 numbers os/td/myd/wat, ecor andhra pradesh 66.00 numbers pwi bchl, ecor andhra pradesh 66.00 numbers pwi-araku, ecor andhra pradesh 143.00 numbers pwi-bhc, ecor odisha 77.00 numbers pwi-jjkr, ecor odisha 132.00 numbers pwi-kur, ecor odisha 275.00 numbers pwi-laxmipur, ecor andhra pradesh 44.00 numbers