A new Orange Line train manufactured by China Railway Rolling Stock Corporation (CRRC) is undertaking a test run at Wellington Yard in Medford, a residential and industrial suburb of Boston, the United States, on May 15, 2018. New subway cars designed and manufactured by a Chinese company are undergoing tests and will be ready to take passengers in Boston by the end of 2018, said local officials on Tuesday. (Xinhua/Li Muzi)