What advantages do the fastest trains in the world have over automobiles?

The most obvious advantage is that you can get to your destination much faster, provided that the train happens to be going to your destination (automobiles retain the advantage of being able to drive pretty much anywhere, unlike trains which have a fixed route). But driving a car carries all sorts of expenses and complications with it. You have to buy the car, buy a license, buy insurance, maintain the car, buy gasoline for the car (admittedly, there are now electric cars as well, which makes that part easier - you have to plug them in periodically to recharge), you have to find parking for the car, and of course, you have to drive the car (unless you can afford to hire a chauffeur). Compare this to a train, which only requires you to buy a ticket.