There is no official news regarding usage of new Third Line even I haven't seen any trains going through that line.Few Parts Between CLX and OGL are almost completed ,Bridges are also done maybe interlocking near station may take time CLX NLR Mostly Likely Will Be Completed By March if any major are needed to
be done it will take time even in Nellore Works are going well, The New Will Be laid between 3rd and 4th Platform For that they Started Leveling The Ground I Had Recently Shared a Pic of Leveling in Station