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In page High-speed rail in the United States:
"With such long and heavy freights often sharing the same tracks as passenger trains, it was necessary to require that passenger cars be able to withstand the higher impact forces of a potential collision with those freights. Axial strength standards, first required for the mail cars where clerks worked sorting mail en route and later applied to passenger cars, require that an American passenger car be able to withstand 800,000 pounds-force (3,600 kN) applied to either end, as opposed to the 450,000 lbf (2,000 kN) European regulations mandate. This necessarily results in American passenger cars being made of heavier materials.[1]
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