This paradoxically works out in favor of the trolley lines, given that they tend to attract economic development to them.
Perhaps I'm looking at it wrong but I look at it as saying the use of trolleys attracts economic development like the parable of the broken window, by breaking a window glass you're creating work for the glass maker. However in reality breaking the glass only diverts money when it can be used for a better purpose. Instead of the kid getting the shoes he needs the money is now spent on glass.
It also sounds like the line that using tax money to pay for a new sports stadium brings in new revenue for the area. Not one economic study I've heard of concludes this is true. Some conclude any benefit is smaller than what was advertised. Others conclude there is no benefit at all.
Portland, OR claims that its streetcar line has spurred billions of dollars of investment in the area surrounding it in a very short period of time.
They may claim it but do the numbers support that? Or is it a broken window parable?
Falcon
Oh, mind you I'm not arguing against improving mass transit, I support doing it, but I'd like to see the numbers crunched. It's easy to be over optimistic when you're not spending your own money.