A worker cleans the wall inside a bullet train at a maintaining base in Xining, capital of northwest China's Qinghai Province, Jan. 8, 2020. As night falls, workers of a railway service company in Xining start their work. Usually, they start from 8 pm and end before dawn. It takes about 3 hours for a 3-worker team to clean a carriage. No matter how onerous the work is, every corner of the trains will be cleaned up. As the 2020 Spring Festival is approaching, workers here are getting prepared to better serve the travel rush. (Xinhua/Zhang Long)