Photo taken on April 11, 2017 shows a technician from China's CRRC Sifang Locomotive and Rolling Stock Co., Ltd. walking on a platform where trains are parked for review at the workshops of the Roca Line, in Llavallol, Argentina. Argentina has embarked on an ambitious plan to upgrade its dilapidated rail transport, taking China as a key partner providing both technology and manpower. The Roca Line is the most heavily used within the metropolitan rail network, which serves the capital and surrounding communities. (Xinhua/Martin Zabala)
