China's railway train numbering system will undergo a comprehensive adjustment in two phases in late November and late December, covering the letter prefixes and numerical ranges currently used for train numbers. A new X prefix will be introduced, mainly for future Fuxing EMU trains with maximum operating speeds above 350 kilometers per hour. The letter X is pronounced "xin", symbolizing "new speed and new products".Train numbers will range from X1 to X9998.
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