20th anniversary of subway operation marked in Shenzhen

Passengers pose for a selfie in a special train marking the 20th anniversary of the subway operation in Shenzhen, south China's Guangdong Province, Aug. 27, 2018. Shenzhen now has 7 subway lines, with total length of 265 kilometers and transporting an average of 4.28 million passengers per day. (Xinhua/Mao Siqian)