SW 1 ) PDPL- NZB section- Supply, stacking of 50mm gauge hard and durable machine crushed stone ballast to Railway ' s specification at ballast depot at KORUTLA station in Secunderabad division and loading the same into Railway hoppers/ Traffic ballast wagons by mechanical means ( Qty- 250000 CuM ). SW 2 ) PDPL- NZB Section: Repairs to existing track machine siding for utilizing of both track machine siding and ballast siding at KORUTLA station.