Stilgoe's arguments are based on the increase of estate prices along railroad lines. According to him, investors are purchasing everything from derelict buildings to gravel plots, which can be easily transformed into parking lots when the time is right, and he expects the time will be right when there are 150 million more Americans (i.e., 2050). By then, no more land will be available for roads, and available roads will be full (see also: Europe). Not to mention that if these new railways can get speeds above 90mph, the notions of urban and extra-urban settlement will be altered. According to Stilgoe, motorists will switch cars to railroads because the more gasoline costs, the cheaper traveling by train becomes (although you should see how expensive is in London, UK). So is the train going to make a comeback in the U. S.? In some areas they already have. One successful example is the Rail Runner service in Albuquerque, N. M.
[Source: Harvard University Gazette (thanks to my buddy Pete for the tip)]