Request for Proposal ( RFP ) for" Design, suply, erection, testing and commissioning of Sectioning Posts ( SPs ) and Subsectioning and Paralleling Posts ( SSPs ) in 2x25kV AT system with SCOTT- Connected transformer on Tenali- Guntur- KCC section" as a part of" Upgradation of existing 1x25kV system to 2x25kV AT system of South Central Railway" on EPC mode