Detroit had been dependent on auto industry. When it was flourishing, the last streetcar line was removed.
When we consider that the city once had 534-mile network of electric streetcars, it's a surprising decline.
Since the second decline which is not about streetcars but about automobiles, the city has been seeking for how to activate its downtown. The inauguration of the new streetcar line would be one of the measures.
Motor City welcomes streetcars
http://www.metro-report.com/news/single-view/view/motor-city-welcomes-streetcars.html