For almost two decades after it opened in 1913, Michigan’s Central Station was a major stop on the nation’s interurban rail network. Then the private car took over the US, and Detroit declined. By the 1970’s, white residents were fleeing to the suburbs, auto jobs were leaving the state and the country, and local corruption soared.  At the turn of the century, the train depot and the 18-story office towers behind it had been abandoned for 30 years, the faded exterior looming over Detroit’s Corktown and Mexicantown neighborhoods, a sign…