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High-speed maglev rail for the RDU area. It will never happen, there's no reasonable ROWs available. I suggest it only as money-losing "show off" project to attract tech business investment to the area. You'd have to steal center lanes from highways or run it through Umstead part, neither of those are happening.
For all the expense and effort you might as well go out in the country to one of the commerce zones and start from scratch - all new airport, all new city.