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What does high-speed rail mean?

High-speed rail is high-speed railway.

High-speed railway refers to a railway system that runs at a speed of more than 200 kilometers per hour by transforming the original line (linearization and gauge standardization) or building a new "high-speed line". High-speed railway not only needs to reach a certain speed standard in operation, but also needs to be upgraded in terms of vehicles, tracks and operations.