A vehicle motion control system comprising: a sliding surface; a vehicle adapted to slide on said sliding surface; and a linear motor associated with the vehicle and the sliding surface for affecting sliding motion of the vehicle on the sliding surface. The trusted record disc can be read on any computer with a network or internet connection, but access to the information on the disc is restricted according to a password protected hierarchical encryption policy. The PSE typically includes a controller that controls the DC power provided to the PD at the second node of the communications link.