People like to call most new large public projects boondoggles, but if politicians followed such negativism religiously,very few useful public projects would be built and the public would find life much more difficult. Yes, even Boston's Big Dig was worth it.
So it is with the idea of putting in a streetcar line in Providence. With the city's thick downtown density, large numbers of college students without cars and an aging population not driving as much these days, I think that the line would do very well in improving the city's economy and quality of life. The rich cities to our north (Boston) and south (New York) owe much of their prosperity to mass transit.