The South Line of Chennai Suburban Railway is the fourth longest suburban line that runs southwards from Chennai (Madras) City.

It is the oldest suburban line of Chennai (Madras), opened in 1931.

The capacity utilisation of Chennai Beach-Egmore-Tambaram section is 69 percent.

The tract travels along the GST Road from St.Thomas Mount to Villupuram.

[1] The first EMU starts from Chennai Beach at 3:55 and the last train at 23:59.