New York Times: Spanish trains whisk passengers from Madrid to Barcelona in little more than two and one-half hours. Japan has bullet trains. China is building a vast network of high-speed rail routes, including the recently opened line between Guangzhou and Wuhan, which covers 1,070 kilometers at the world’s fastest average speed. Soon, perhaps, the United States, with the world’s largest economy will also clamber on board. So far, the United States – in spite of or perhaps because of its vast …