replacement of 8 swg gi wire with 2 x 2.5 sq. mm cables for track circuit and provision of double tld boxes in jolarpettai salem, salem mettur thermal power plant and salem market/replacement of 8 swg gi wire with 2 x 2.5 sq. mm cables for track circuit and provision of double tld boxes in jolarpettai – salem, salem – mettur thermal power plant and salem market