Levitating Cars?

I'll do it. I become rich by laying down maglev tracks across the entire world.

If you're talking about over ocean travel, tracks wouldn't be the way to do it. Something more along the lines of buoyant tubes would be more practical.
But hey, go for it bro.

But wouldn't that block travel of cargo ships?

Say, you're building these buoyant "tubes" across the Atlantic, from someplace in the Tri State of the United States, to France. You're done building, however, this intercepts exported products from many countries into Canada. Theres also another issue, how are you going to get these buoyant tubes the power sufficient to run a magnet capable of lifting and moving these trains? and what would happen if these tubes were destroyed in a violent ocean storm.

It's just not practical, in most cases, these trains would have to be built for the country who's starting the build, and maybe across borders, but only if that border is shared with another country, not an ocean or sea. Although, there is one exception with Japan, couldn't they get those buoyant "tubes" from their islands to mainland Asia?

Hey man, its better then just laying track across the ocean.

Not really, both options would still block sea traffic.

Not taking into consideration that in the event that such a project is completed, there would be no sea traffic? After all, who needs boats when Transoceanic Maglev is online?

I suggest you take a look at this if you're interested in the idea.
http://www.popsci.com/scitech/article/2004-04/trans-atlantic-maglev

Cool idea, although, there are some flaws.

• Nobody can afford this in any length of the railway and the new advanced technology.
• There have not been effective tests determining that the vacuum used to keep the magnet's functioning properly will instead disturb the magnets and not move or keep the train levitating. (if there have been, please cite references)
• The tunnel would have to be built in deep water, or else it will still disturb sea travel.
• This would increase maintenance costs due to magnets and vacuums used in high pressure ocean waters causing the tunnel's structure to deteriorate, possibly.
• How would maintenance workers be able to go into the tunnel, to the middle of the Atlantic ocean, and work one shift repairing one section and return to his home.
• There would be so few countries able to export their products due to them not being able to afford these trains.
• The load capacity is insufficient in comparison to an average freighter.

Like I said, theoretical. At this stage its bound to be unrefined and flawed.