No Hunting
This article reviews that wheels riding along parallel tracks have to balance diameters by “hunting.” Hunting wears down both wheels and rails, because a wheel must move sideways to find balance. The wheels, much like a pup chasing the phantom tip of a cropped tail, seek an accord they can never reach. Auto manufacturers might say all that energy used to go toward metal forming of the unwanted variety. American freight lines carry heavier loads than their counterparts in Europe. In Europe, passenger rail exerts more influence over railroad infrastructure than it does in the United States. Abc-Naco designed a variant of its domestic swing motion truck for European rail. Dubbed Axle Motion, the truck incorporates the same design philosophy of decoupling lateral forces from the car body that inspired the swing frame.