Aerial photo taken on March 19, 2020 shows trains at a maintenance base in Zhengzhou, central China's Henan Province. A lot of trains of China Railway Zhengzhou Group Co., Ltd. were suspended due to the epidemic prevention and control work during the Spring Festival travel rush. As the epidemic situation has been eased, these trains demand maintenance and thorough check ahead of resuming service. Staff members of the corporation are busy conducting maintenance to guarantee the safety and smooth operation of these trains. (Xinhua/Li An)