A subway train to be used for the 2016 Olympic Games in Rio de Janeiro rolls out at Changchun Railway Vehicles in Changchun city, Northeast China's Jilin province, May 25, 2015. China has delivered all 15 subway trains that will operate on Line Four, between the Olympic village and the Copacabana game center, in Rio de Janeiro, the first time Chinese railway development has catered for an overseas Olympic Games. (Photo: China News Service/Zhang Yao)