| West-North Line | |
| Type: | Suburban railway |
| System: | Chennai Suburban Railway |
| Status: | Operational |
| Start: | Chennai Central (Madras Central) |
| End: | Tirupati (city) |
| Stations: | 40 |
| Operator: | Southern Railway (India) |
| Depot: | Avadi |
| Linelength: | 151 km (82 km Suburban and 69 km MEMU) |
| Tracklength: | 412km (256miles) |
| Tracks: | 4 (till Arakkonam) 2 (till Tirupati (city)) |
| Gauge: | Broad Gauge |
| Speed: | 90 km/h (maximum service speed) |
| Map State: | collapsed |
The North west Line of Chennai Suburban Railway is the fifth longest line that runs west–north from Chennai City. Suburban services terminate at Tiruttani and MEMU services run till Tirupati, across the state line in Andhra Pradesh.