Provision Of Indoor And Outdoor Signalling & Telecommunication Arrangements At Thiruvananthapuram Central Station, Signalling And Interlocking Arrangements At Lc Gates And Indoor And Outdoor Signalling & Telecommunication Alterations At Thiruvanathapuram South Station To Suit Twin Single Line Between Thiruvananthapuram Central And Thiruvananthapuram South Stations In Connection With Doubling Of Track Between Thiruvananthapuram Central & Kanniyakumari Stations.