supply of manufacture and supply of hvn-66 insulating liner conforming to rdso drg. no.t-6939 & t-6939 alt-2 for use with wider psc sleeper to drg. no t-8527 suitable for 60kg/60e1 rail.manufacture and supply of hvn-66 insulating liner conforming to rdso drg. no.t-6939 & t-6939 alt-2 for use with wider psc sleeper to drg. no t-8527 suitable for 60kg/60e1 rail.,manufacture and supply of hvn-66 insulating liner conforming to rdso drg. no. t-6938 & t-6939 alt-2 for use with wider psc sleeper to drg. no t-8527 suitable for 60kg/60e1 rail. this is a s afety item. specification: irs specification for glass filled nylon-66/ high viscous nylon-66 insulating l iners sl. no t-44-2023 (second revision). n.b: each set comprises of one hvn liner to drg. no. t-6938 and one hvn liner to drg. no. t-6939 [ warranty period: 30 months after the date of delivery ] ] dsk-s-c-wat, ecor andhra pradesh 55000.00 set