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Mr. Hilton, in his Trains piece called SLACK, includes a table of coupling impact forces expressed in foot-pounds. He says that when a 75 mph, 100-car train goes into emergency, the slack run-in force can reach the level of a 14 mph single car impact during switching.  This impact would amount to 937,860 foot-pounds. To put that into perspective, that would be the energy of 468 tons of force sustained over a distance of one foot.  468 tons is roughly the dead weight of two modern locomotives or three loaded cars. Mr. Hilton says this much impact force will aggravate the cars ahead enough to derail the train.
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