supply of manufacture and supply of wider psc sleepers to rdso drg.no.t-8970.manufacture and supply of wider psc sleepers to rdso drg.no.t-8970.,manufacture and supply of wider pre-stressed mono block concrete sleepers (pre-tensioned type) for broad gauge (1673 mm) conforming to as per rdso drg.no. rdso/t- 8970 (alt. 1) to suite 60 kg (uic)/ 60 e1/ 52kg running rails with 60 kg (uic)/60e1/ 52kg guard rail for use on ballasted deck bridges and as per irs s pecification t-39 (6th revision- march 2021) with corrigendum no.1, with latest alteration if any. [ warranty perio d: 60 months after the date of delivery ] => limited