Nobody is noticing my point:
http://www.moller.com/
0 infrastructure + great speed + individual freedom
Even the claimed energy usage is reasonable.
For urban and suburban transportation, nothing should beat a SkyCar.
Need something big moved, like 1000 tons of coal? Then trains are good I agree…
Still using open-source design process, simple materials, local resources, advanced nano-technologies with cheap and plentiful energy might retire the old
mine-move-process-move-manufacture-move-sell-move model. Just download the design and turn on your 3d printer.
What other resources you might need if you have access to sea water and plenty of cheap energy?