Hello how may I help you? What is the worlds fastest train ? The request is too vague. Can you please be more specific. Is it not specific ? Do you mean a monorail, express train, or high-speed train? High speed The worlds fastest high-speed train is the Great Train of China. Does this answer your question? what's the MPh ? It goes over 250 miles per hour. thanks Do you have any more questions for me today?