This photo shows an interior view of a business class carriage of the CR450BF bullet train in Beijing, capital of China, Dec. 29, 2024. A prototype of the CR450 bullet train that will run at 400 kilometers per hour debuted in Beijing on Sunday, said the country's railway operator China State Railway Group Co., Ltd. The train is capable of running at 450 kilometers per hour in test. [Photo/Xinhua]