Via The Register:
Promoters in Las Vegas this week vied to offer the wildest ideas for a new super-fast mass transit link between the desert gambling mecca and Los Angeles. Plans were presented for a “railless” train which would fly through magnetic rings mounted atop pillars and a “sunlight bullet expressway” employing “large air-cushioned hovercraft”.
Fans of the great Robert Heinlein will recognise some of these ideas. The late sci-fi master wrote long ago of America-spanning “road cities” powered by rooftop solar panels, and also of zooming airborne trains which would soar between tunnels bored through hills (beginning of Starman Jones).