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A stewardess walks down the aisle of a new-type of bullet sleeper train, which began running on the Beijing-Shanghai line on July 1, 2017. The train, designed and manufactured by CSR Qingdao Sifang Co Ltd, can travel up to 250 kilometers per hour. The new sleeper train, 37 percent bigger than the former model, now has room for 880 passengers. Thanks to the latest noise and vibration control techniques, the noise in the carriage is now under 62 decibels. [Photo/VCG]