Ditto to Uli's and KS's statements about trains. I worked one day in the hump yard located in Hamlett, NC, and witnessed the "violence" train cars endure when they couple to each other. The railroad (CSX) was building a train that had several rail cars loaded with new automobiles. When a slowly-rolling rail car would couple onto a static rail car, the collision was powerful enough to set of the automobile alarms.

Also, they built trains that carried scrap metal in open gondola cars. HEAVY scrap metal lined the tracks in the yard, having been ejected from a moving gondola when it coupled to a stationary car. Impressive!

I would not want my precious cargo go through with that type of brutal handling!

Ray