Code of Federal Regulations Title 49. Transportation § 49.238.219 Truck-to-car-body attachment

Except as provided in § 238.201(b), passenger equipment shall have a truck-to-carbody attachment with an ultimate strength sufficient to resist without failure the following individually applied loads:  2g vertically on the mass of the truck;  and 250,000 pounds in any horizontal direction on the truck, along with the resulting vertical reaction to this load. For purposes of this section, the mass of the truck includes axles, wheels, bearings, the truck-mounted brake system, suspension system components, and any other component attached to the truck by design.