A staff member wearing China Railway Rolling Stock Corporation(CRRC) uniform is pictured in a new Orange Line train manufactured by CRRC 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 CRRC 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)