The Blue Line of Chennai Metro first became operational on September 21st, 2016. At 23.1 km, it is almost as long as the Green Line, and it also has the same number of stations at 17. The trains on Blue Line, consisting of four coaches, have a maximum speed of 80 km/h and headway of 5–15 minutes. Overhead wires, carrying 25 kilovolt alternating current, and 1435 mm (standard gauge) tracks are used on the line. The line runs from south-western Chennai towards the northeast.
Stations on Blue Line
| Station | Interchange/Connections |
| Washermanpet | |
| Mannadi | |
| High Court | |
| Central | Green Line; Chennai Central Railway Station |
| Government Estate | |
| LIC | |
| Thousand Lights | |
| AG-DMS | |
| Teynampet | |
| Nandanam | |
| Saidapet | |
| Little Mount | |
| Guindy | |
| Alandur | Green Line |
| Nanganallur Road | |
| Meenambakkam | |
| Airport | Chennai International Airport |
Further Extension of Blue Line
Under Phase II of Chennai Metro, the line is being extended further beyond Washermanpet by eight stations till Wimco Nagar.
Top Attractions Connected by Blue Line
| Attraction | Nearest Station | Distance from Nearest Station (Km) |
| St Thomas Mount National Shrine | Nanganallur Road | 1.7 |
| Guindy National Park | Guindy | 2.6 |
| Karaneeswarar Temple | Saidapet | 1 |
| Pondy Bazaar | Nandanam | 1.3 |
| Semmozhi Poonga | AG-DMS | 1 |
| Thousand Lights Mosque | Thousand Lights | 0.7 |
| Spencer Plaza Mall | Thousand Lights | 0.5 |
| Express Avenue Mall | Thousand Lights | 0.8 |
| Fort St George | High Court | 1.5 |
| Marina Beach | Government Estate | 2.9 |
| MA Chidambaram Stadium | Government Estate | 1.9 |
| Government Museum | Government Estate | 2 |
| Vivekananda House | Government Estate | 2.9 |
| MGR Museum | Government Estate | 1.9 |
| Parthasarathyswamy Temple | Government Estate | 2.2 |
Chennai Metro Blue Line Map
