Background

Train Pciture

The idea of a train held up by magnets originated in germany from a man named Alfred Zehden who was awarded the patent in 1905. This idea would continually be developed as time progressed when in 1962 Japan began to research Maglev technology. The United States began not long after, in 1969 with researchers James Powell and Gordon Danby recieving the first patent for a superconducting maglev transportation system.
China launched its first commercial maglev train system, titled the Transrapid system, in 2004 and only a year later Japan started a speed system named Linimo. Since then other countries have picked up the Maglev system such as France, Germany and Spain.
Why would we need another train system? Why don't we just fly?
In short, planes burn a lot of fossil fuels to fly a small amount of people. According to Boeing's website, a gallon of fuel is burned every second. This means a 10 hour flight can burn more than 36,000 gallons of fuel. Maglev trains have no fossil fuel motor and thus produce no carbon emission leading to a much more environmentally friendly impact. Because there is no massive fuel consumption with maglev trains the cost of a ticket is significantly less, a one way ticket in Shanghai costs about 8 USD.
There are also extensive security checkpoints that are required for flight whereas the Maglev train system, while not lax, has less extensive security measures. There also is minimal time waiting for the train to receive the go ahead for beginning the journey.
Maglev trains also have the luxury of not having to worry about weather conditions as much as planes. Heavy winds, ice, lightning, etc, do not factor into the maglev system due to the lack of contact between physical surfaces. The train will simply float about any ice on the track as ice does not impede magnetic field movement.
Airplanes are rigidly locked into certain routes where a maglev train can be more flexible in where it stops and travels. It can make intermediate stops much easier than a plane can as all it has to do is brake as opposed to landing.
Currently airplanes dominate the long distance travel medium but with more research into Maglev systems we could soon see a contender. Elon Musk wants to build the hyperloop (See What's next) which would make short work of long distances.