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S. Korea develops core tech for world's 2nd-fastest 370 kph high-speed train
S.Korea develops core tech for world's 2nd-fastest 370 kph high-speed train
SR-72: US secret hypersonic jet to allegedly break sound barrier in 2025 | Believed to be a top-secret project of the US Air Force, the SR-72 is touted to reach over 4,000 mph (6,437 kph), making it the fastest plane ever developed.
