With the Railway Board having accorded approval for the fourth-line project from Tambaram to Chengalpattu, the work is expected to begin next month.

At present, suburban train services on the southern section operate from Beach to Tambaram, and then Chengalpattu. The fourth-line project is a crucial track expansion aimed at easing congestion for mail, express, and suburban train services.

Sharing details of the Detailed Project Report (DPR) of the proposed fourth line, officials said that at present, suburban train services in this section cannot be increased due to the operation of mail and express trains on two lines.

The 30-km track expansion project, to be executed at an estimated cost of ₹713 crore, has become crucial due to the presence of several private colleges, manufacturing hubs, as well as the Kilambakkam bus terminus in the section.

With the announcement of Tambaram as the third railway terminal and Chengalpattu emerging as the gateway to the south corridor, the project will help increase suburban train services.