CHENNAI: The construction wing of Southern Railway has invited fresh tenders for the construction of the third and fourth railway lines along the 23-km Athipattu-Gummidipundi section of the North Eastern suburban network, raising the project cost by Rs 70.56 crore. The initial tender, floated in March this year for Rs 285.6 crore, has been revised to Rs 356.16 crore after the contract could not be finalised due to the low project cost, official documents revealed. The project involves laying the third and fourth lines, upgrading station infrastructure, and carrying out general electrical and...