Super Fast Safe Trains: Why don't we have them?

The history of Maglevs is pretty darn fascinating.  Did you know they could go up to 4000 mph!  They were invented in 1902!  Why do we have to wait for them to come to our city?  We'd like to write a much longer post, but the Maglev Wiki is pretty swell.  

Sorry that we didn't have time to add photos.  Let us know if you have any to add.