3rd Line & 4th Line between Duvvada ( DVD )- Simhachalam North ( SCMN ) & Doubling between Ore Exchange Complex ( OEC )- Simhachalam North ( SCMN ): Execution of Earth- work in formation, blanketing, Minor bridges, Major Bridges, Box Pushing Bridge, PSC Slabs, drains, Protection works, Construction of Tower Wagon Shed, Signal Cabins/ S & T Goomties, FOB, Platform works, Platform shelters, execution of P. way works, welding of Rail joints, supply of ballast, Transportation of P. Way materials, Electrical General services works, dismantling of existing buildings/ structures, utility shifting of infringing S & T gears and cables and other connected ancillary works of Waltair Division, East Coast Railway