Chicago and Detroit are about 280 miles apart. Take Amtrak from one to the other, and you’ll be on the train for 7½ hours.Beijing and Shanghai are about 750 miles apart. Take China’s high-speed rail between them, and you’ll be on board for 5½ hours.“I went the equivalent of O’Hare to the Hancock in five minutes,” said Mitchell A. Capp, a 2L at The John Marshall Law School, about China’s magnetic levitation train known as the “Maglev.”“I was blown …