Something just occurred to me: Is the levitating vac train concept just a feint? The technology developed for building electric semi trucks would also be useful for building highly streamlined electric trains. With automated piloting, the difference between the two would be blurred! Is Elon aiming to become the railroad tycoon of the 21st century?

I don't think air resistance is the largest cause of expense in transportation. Am I wrong here? How much does it cost to overcome air resistance per mile in trains and trucks?