Massive redevelopment plans are underway for Salt Lake City... now a new report suggests moving some of Salt Lake City's railroads underground... and it comes with a hefty price tag… but it could pay off for Salt Lake in economic growth. The Rio Grande Plan is a proposal to drop the existing railroad underground and would give the land back to the city to develop new homes and businesses on the land currently being used by the rail. KSL.com's Carter Williams brings the latest from this report and the challenges that could come with it.  Vice Chair of the Salt Lake City Council, Alejandro Puy shares the argument for the idea and how this could help an already land starved city expand.