KENYA—I sit on a train, halfway between Mombasa and Nairobi, on Kenya’s brand new Standard Gauge Railway. As we wait for another train to pass on the line’s single track, riders begin to stand up and peer through the closed square windows. Within minutes, a blur of white and orange flies past us, and a wave of whooping and laughter ripples through the coach. A grinning passenger turns to me and explains, “You can’t feel the speed from the inside of the train.” More….