doubling of track between turavur - mararikulam (tuvr - makm) section:- proposed earth work in formation, modification of lcs, provision of s&t accommodation and gate lodges, provision of cable ducts, side drains, retaining walls, construction of platforms, construction of fobs, provision of platform shelters, protective works, proposed extension of minor bridges along with p.way works at cherthala yard (km 32/100-km 34/300) (length = 2200 m) and mararikulam yard (km 43/300-km 45/100) (length =