The Blue Line or ORR-Airport Metro Line is part of the Namma Metro rail network for the city of Bangalore, Karnataka, India. It consists of two sections – Phase-2A (Silkboard to KR Puram) and Phase-2B (KR Puram to Airport). Construction of Phase-2A began in August-2021. Construction of Phase-2B is expected to begin in February-2022. The 58.19 km line connects Central Silk Board with the Kempegowda International Airport. The Line is mostly elevated but also has an at-grade (surface) section close to the Airport and 2 short underground sections where it passes the Jakkur Aerodrome and Yelahanka AFB. There are 30 stations on the line of which the two station/s at the Airport may be at surface level or underground. Blue Line will have interchanges with the Yellow Line at Central Silk Board, Purple Line at KR Pura, Pink Line at Nagawara and with the future /proposed Orange Line at Hebbal.
In June 2022, BMRCL launched the first ever U Girder span on ORR-Airport metro line.[1][2][3] The extension of the Purple Line and construction of the Pink and Yellow Lines is currently in progress. Pink, Yellow and the Blue Line will be CBTC signaling enabled, unlike Namma Metro’s first two lines (Purple and Green Lines use distance-signaling).
| Blue Line | |||
|---|---|---|---|
| Phase-2A (Expected 2026) | |||
| # | Station Name | Connections | |
| English | Kannada | ||
| 1 | Central Silk Board | ಕೇಂದ್ರ ರೇಷ್ಮೆ ಮಂಡಳಿ | Yellow Line (Under Construction) |
| 2 | HSR Layout | ಎಚ್‌ಎಸ್‌ಆರ್ ಬಡಾವಣೆ | |
| 3 | Agara | ಅಗರ | |
| 4 | Ibbaluru | ಇಬ್ಬಲೂರು | |
| 5 | Bellanduru | ಬೆಳ್ಳಂದೂರು | |
| 6 | Kadubeesanahalli | ಕಾಡುಬೀಸನಹಳ್ಳಿ | |
| 7 | Kodibeesanahalli | ಕೋಡಿಬೀಸನಹಳ್ಳಿ | |
| 8 | Marathahalli | ಮಾರತಹಳ್ಳಿ | |
| 9 | ISRO | ಇಸ್ರೋ | |
| 10 | Doddanekundi | ದೊಡ್ದನೆಕ್ಕುಂದಿ | |
| 11 | DRDO Sports Complex | ರ.ಸಂ.ಅ.ಸಂ. ಕ್ರೀಡಾ ಸಂಕೀರ್ಣ | |
| 12 | Sarasvathi Nagara | ಸರಸ್ವತಿ ನಗರ | |
| 13 | Krishnarajapura | ಕೃಷ್ಣರಾಜಪುರ | Purple Line;  KR Puram Railway Station |
| Phase-2B (Expected around 2026) | |||
| 14 | Kasturinagara | ಕಸ್ತೂರಿನಗರ | |
| 15 | Horamavu | ಹೊರಮಾವು | |
| 16 | HRBR Layout | ಎಚ್‌ಆರ್‌ಬಿಆರ್ ಬಡಾವಣೆ | |
| 17 | Kalyan Nagara | ಕಲ್ಯಾಣ ನಗರ | |
| 18 | HBR Layout | ಎಚ್‌ಬಿಆರ್ ಬಡಾವಣೆ | |
| 19 | Nagawara | ನಾಗವಾರ | Pink Line (Under Construction) |
| 20 | Veerannapalya | ವೀರಣ್ಣಪಾಳ್ಯ | |
| 21 | Kempapura | ಕೆಂಪಾಪುರ | Orange Line (Planned) |
| 22 | Hebbala | ಹೆಬ್ಬಾಳ | Hebbal TTMC; Hebbal Railway Station |
| 23 | Kodigehalli | ಕೊಡಿಗೇಹಳ್ಳಿ | |
| 24 | Jakkuru Cross | ಜಕ್ಕೂರು ಅಡ್ಡ | |
| 25 | Yelahanka | ಯಲಹಂಕ | |
| 26 | Bagaluru Cross | ಬಾಗಲೂರು ಅಡ್ಡ | |
| 27 | Bettahalasuru | ಬೆಟ್ಟಹಲಸೂರು | |
| 28 | Doddajala | ದೊಡ್ಡಜಾಲ | |
| 29 | Airport City | ವಿಮಾನ ನಿಲ್ದಾಣ ನಗರ | Airport City (Proposed) |
| 30 | KIAL Terminals | ಕ.ಅಂ.ವಿ.ನಿ ಕೊನೆಯ ನಿಲ್ದಾಣ | Kempegowda International Airport |