Construction began in June 2000 by a consortium comprising SembCorp Industries, Mitsubishi Heavy Industries and Mitsubishi Corporation, at a cost of S$354 million. Construction of the first phase was completed in June 2004, and underwent testing by the Land Transport Authority. The system was handed over to SBS Transit on 1 December 2004, who conducted more trial runs and staff training before the opening of the East Loop on 29 January 2005. The West Loop opened on 29 June 2014.