BMRCL is targeting May 2027 to launch Blue Line connecting KR Pura and Central Silk Board, subject to the completion of testing and statutory clearances. You are using an outdated browser. Please upgrade your browser to improve your experience and security. Bengaluru metro blue line trial runs advance towards mainline testing According to officials, the 58.19-km Namma Metro Blue Line, also known as the Outer Ring Road-Airport Metro corridor, will.