The West South Line of Chennai Suburban Railway

Chennai suburban railway

Chennai suburban railway is a commuter rail system in the Indian city of Chennai operated by the Southern Railway. Chennai has a complex railway network. The system uses electrical multiple units operating on alternating current drawn from over-head cables through the catenary system...

 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 Beach (Madras Beach) - Tiruvallur

• 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.

Tiruvallur - Arakkonam

• Suburban trains operate in the 2 main lines.
• 3rd rail line is completed & 4th rail line is under construction.
• 9-car and 12-car EMU are operated in this sector.

Arakkonam - Katpadi

• Suburban trains operate in the 2 main lines.
• 9-car and 12-car EMU are operated in this sector.

Katpadi - Vellore Cantonment

• MEMU service operate between Chennai Beach
  Chennai Beach
  Chennai Beach , formerly known as Madras Beach, is a railway terminus of the Southern Railway Network in Chennai , India. This station handles mainly suburban trains in Chennai suburban railway and a few passenger trains...
  
  and Vellore Cantonment via Katpadi.

Vellore Cantonment - Villupuram

• This section has been gauge converted and is being electrified along with passenger services are operating since June. Currently only one passenger train plies over this section