From small steam engines
To the extremely stong steam engines
To the modern desiels.
To our future, Maglev,Sorry its kinda messed up
These will be traviling at 400mph.
Here is one of the later models,
This will explain how it works. those are magnets if you were wondering
I think these while totally beat planes.They can go as fast as we want but we need a material that can withstand the force. If you have any questions I will try to get back to you as soon as possible.[;)]