Impressive as China's bullet trains may be, it's unlikely that the U.S. will enjoy a similarly connected intercity rail system, writes Megan McArdle, economics editor of The Atlantic. China's booming cities are large and close together, while in the U.S. they are not, except in the Northeast. In just five years, China has more high-speed track than any other country in the world. Support for construction of high-speed rail in the U.S. has been choppy, with New York, Florida and California moving forward, while Midwest states waver.

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