Well, for those of you who instinctively and validly asume that big, heavy trains are nothing to mess with, I can assure you, that is still the case. But actually there are forces mother nature has ready, wich are perfectly capable of playing with these trains like little plastic toys. In the following vid you’ll see a mighty american cargo train moving along somewhere in the middle of nowhere of Illinois, if I remember correctly, as suddenly within seconds the sky is getting grey and foggy, the surveillance cam gets pretty wet, trees are bending in the background and things get slightly out of control…
Is this tornado bitching out or what! – and that propane-waggon coming closer and closer afterwards is pretty intimidating! 
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This video was even more spectacular:
Remember how your mom once told ya: Always look to the left and to right side. Hold on… That was just meant if you want to cross a street not a railway. Nevermind. It´s the train driver´s fault.