usually running along elevated tracks. Like other trains, they relieve ground traffic by attracting passengers who would otherwise be using public or private road transport.
the materials used
The go fast 250 km/h and more
vvv
You must mean a Maglev train. A Maglev train operates on maglev (magnetic levitation). It uses electromagnets (and possibly superconductors) that repel each other to lift the train above the ground to reduce as much friction as possible.
yes, there is,Added: I don't believe that ther are any operaing in a commercial application.
This cannot be answered in the way it was asked. Maglev refers to magnetic levitation trains. This is limited to passenger trains. There are many systems in use on a maglev train system, not simply magnetic levitation - the magnetic levitation is in use in other systems, such as manufacturing, and has even been examined as a part of launching space vehicles, but is not referred to as "maglev".
Neither touches the ground with anything solid like wheels.
No contact with the ground (thus less friction).
Two opposing magnets (North in the track and South in the train or vice versa), and a heck of a lot of electricity! * Added - To expand on the over simplification above - powerful electro-magnets are placed in the maglev guideway and in the maglev vehicles. A sophisticated computer control system pulses the magnets to provide both upward lift, forward propulsion, and braking. This lets the maglev move and stop in a straight line - for an actual train, there are many more subsystems and components for the train to actually work.
maglev is short for Magnetic Levitation.
"Maglev" is.
Maglev means magnetic levitation. So the train is not touching the track, in fact once the engines are fired up, the entire train lifts about one cm off the track. So ice is irrelevant to a maglev vehicle. Unlike conventional vehicles which use friction as a braking force, e.g., tires on a road, a maglev uses eddy currents produced in the track as a result of magnetic force as both propulsion and braking methods.