The West South Line of

Chennai Suburban Railway The Chennai Suburban Railway is a commuter rail system in the city of Chennai, Tamil Nadu, India, operated by the Southern Railways branch of Indian Railways. It is the second largest suburban rail network in terms of route length and the third ...

is the longest line running west-south from Chennai (Madras) City covering a distance of almost 289 km. Suburban services terminate at Arakkonam and MEMU services currently run till Vellore Cantonment which will be extended up to Villupuram upon completion of Vellore Cantonment and Villupuram section.

Chennai Central - Thiruvallur

* This section has 2 dedicated lines for suburban train operations apart from 2 main line for mixed traffic. * EMUs are operated along 3rd and 4th main lines during peak hours. * 5th and 6th rail lines are planned. * 9-car and 12-car EMU are operated in this sector.

Thiruvallur - Arakkonam

* This section also has 2 dedicated lines for suburban train operations apart from 2 main line for mixed traffic. * 9-car, 12-car EMU & MEMU are operated in this sector.

Arakkonam - Katpadi

* 8-car MEMU are operated in this sector.

Katpadi - Vellore Cantonment

* MEMU service operate between

Chennai Beach Chennai Beach (formerly known as Madras Beach) (station code: MSB) is a railway terminus of the Southern Railway network in Parry's Corner, Chennai, India. Built on reclaimed land, the station serves the suburban services of the Chennai Suburb ...

and Vellore Cantonment via Katpadi.

Vellore Cantonment -Tiruvannamalai- Villupuram

* This section has been gauge converted and is being electrified along with passenger services are operating since June. Currently five passenger trains ply over this section {{Railways in Southern India Chennai Suburban Railway