You could always house them in trailers like FEMA does after Hurricanes and other Natural Disasters! I'm sure BNSF could cut a deal with a Mobile Housing Manufacturer!
And ship them in on the uncrowded freight line? And hook them up to what water and sewer? There are already huge temporary housing areas called (I'm not kidding) "man camps" which are built as fast as they can be. Me, I like to have a basement out on the prairie, but
YMMV.
Yeah, the "man camps" have been visible from the Empire Builder for at least the last two years. What we used to call "trailer courts" but with "hot bunking" -- sheesh - the Bakken is a "boom town" - these $30/hr (absolute minimum wage) - dishwashers get $40, laborers get much more) but pay $3500/month absolute minimum for a time-share on a narrow bunk in a single-wide. You want a room of your own, you commute from SPK or MSP, or pay twice San Jose prices for any lodgings.
It's hard to convince outsiders just what a boom-town the Williston area is. It is insane. Might be a bit like the 49'ers. It is totally insane.