http://hackaday.com/2014/04/22/retrotectacular-the-science-of-derailing-trains/
Very interesting. If only our trains were so hard to derail!
Yeah, fun to watch, even if it’s been posted several times here and MLS.
Greg
Stupid Army. Any sailor could have told you that if you want to derail a train, you have to do it on a curve. 
The only submarine to attack Japan during WWII wrecked a train.