I've seen systems in places like Portland and Minneapolis. But they are more of a light rail than a trolley. I see this as just like the high speed train that was proposed between Madison and Milwaukee. Yes, there are federal dollars to get it built. But once those are done and spent, it will be a money loser and the tax payers pick up the tab. It's a novelty, not a realistic transportation piece. Money would be better spent adding some buses and police to cut down on crime.
I can't wait for winter with heavy snow and ice hanging on the wires. Or a plow truck with the bed raised to get the salt out snagging a wire. Or some idiot doing 40 mph on an icy street plowing into the trolley. It will interesting. I like calling it the Barrett Folly Trolley. "Ignore the issues of car jacking, drugs, and armed robbery. What this city really needs is a Trolley! That will bring people back."