Maglev System? Need info, please?

What is the minimum speed that a Maglev train can run efficiently? Also, can anybody suggest a good site with info on this system?
Thanks.

Answer:
Maglev trains could remain levitating without forward motion, so the minimum achievable speed is "zero".

They aren't energetically very efficient anyway since lots of energy is used up keeping the train levitating, and making it go forward just uses more energy. Efficiency isn't the main attraction of maglevs. It's speed.

Since they are levitating, there's very little friction. The only resistance comes from air viscosity and what are known as magnetic induction and eddy currents. But these are much more easily overcome, and maglevs can reach very high speeds (topping 300 mph or almost 500 km/hr).

A good site for introductions to such topics is <a href="http://www.howstuffworks.com/maglev-trai... target="_blank">Howstuffworks.
Here are some sites with great explainations and diagrams.

http://science.howstuffworks.com/maglev-...

http://en.wikipedia.org/wiki/magnetic_le...

http://www.o-keating.com/hsr/maglev.htm...

Happy levitating!

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