And even if, by some miracle, 10 billion is enough to finish the rail, no one is really planning for afterwards:  maintenance, infrastructure upkeep, electricity management....  Who will pay for that?  Ridership, even if it's really great, which I doubt, will be government subsidized, so who do you think pays for the subsidy?  My prediction is that if the rail is ever finished, whoever is mayor at the time will be back at the state legislature begging for the current tax increase to continue forever.