Apparently Independently Rotating Wheelset - a possible solution for all needs?

The paper describes a patented innovative railway wheelset (AIR Wheelset) where the wheels are rotating supported by roller bearings and are torsionally connected via a shaft with proper stiffness. This arrangement can dramatically change maintenance operations while keeping optimal running stability at high speed. Better curving characteristics can be obtained by a version where the torque transmitted through the shaft is limited by torque limiters, possibly reducing rail corrugation and improving negotiation of tight curves.