Ranken Infrastructure secures contracts for Guiyang and Qingdao metro rail projects, China December 9, 2015 | Asia Pacific News China-based rail engineering company Ranken Infrastructure, which was acquired by Singapore-based Sapphire Corporation in September 2015, has secured the CNY428-million contract to develop a 2.3... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password