if ya ride your sissy yellow-colored banana-seated bicycle at a top speed of ten miles-per-hour into a brick wall , multiply that force by a factor of number three plus the gross tonnage of a locomotive which exceeds your body weight by 269,850 times , since a locomotive can move a fully loaded semi-tractor truck all the way to the muddy banks of the tennessee river by itself , add in some running engines moving with 1,000 horsepower , then the impact breaks the human skeleton bones into tiny pieces , even through the skin may not be broken .