The Railway Board had previously allocated ₹713 crore for a new fourth railway line between Tambaram and Chengalpattu. Now, it has approved a total of ₹2,576 crore for the construction of three new railway lines: ₹929 crore for a new double line on the Arakkonam–Chengalpattu route and ₹934 crore for a double line between Erode and Karur.