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10. California High- Speed Rail–$ 100 Billion
The California High- Speed Rail is set to revise transportation in the U.S., offering a presto,eco-friendly volition to air and road trip. With an estimated cost of$ 100 billion, this high- speed train system will connect major Californian metropolises, reducing trip time between San Francisco and Los Angeles to under three hours. Despite facing detainments and budget challenges, parts of the road are under construction, with full completion anticipated in the 2030s.