Senbo Engineering and ITD Cementation emerge as lowest bidders for Kolkata Metro Line 4 extension, India March 20, 2022 | Asia Pacific Company News, Asia Pacific News, Company News, News Senbo Engineering and ITD Cementation India have emerged as the lowest bidders for a 3.6-km underground extension of Kolkata Metro’s Line 4 from Kolkata Airport (Bimanbandar) to New Barrackpore. Metro... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password