Maglev trains do not use gas, so they are good for the environment.
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maglev is short for Magnetic Levitation.
"Maglev" is.
No, but this is subjective. The speed of the maglev has no adverse effects as it operates on a dedicate and elevated guideway, so should not be considered "bad".
I'm not too sure about the advanced physics of this, but I know that it is desired for Maglev trains to not touch the track so that their speed can be maximised, and so there is no wear and tear of the track and contact. The speed would be maximised because if you don't touch the track there is no friction. Even wheels are slowed by friction so the only way to completely eliminate it is to have no friction.
Maglev trains have the technology to reach speeds in excess of 3,000 mph but any speed in excess of 300-400mph becomes impractical. The top speed depends more on how and where the maglev is built, how far apart stations are, and how much maintenance cost is considered acceptable. So, for the trains proposed so far today and may be in service in the next 20 years, it maglev trains will not exceed 400mph.
trians steamboats steam engines
They get on from an opening passage way that comes out of the maglev train
A small, three car maglev train weighs more or less 100 tons, so they are relatively light trains.
Lots of electricity ... which takes power.
The Chinese city of Shanghai is reported to have a Maglev train in commercial use. The Japanese and Germans are working on Maglevs so are the USA.