Guiding principles of three different modes of wheel-rail systems, traditional wheelset, independently rotating wheel and coupling wheelset, are analyzed in details.

Based on the simplified parameter-lumped dynamical model which dominates the vertical vibration of wheel-rail system,the state equations of the wheel-rail coupling nonlinear dynamic model are derived,in which the Hertz nonlinear contact force is adopted to simulate the wheel-rail interactions.

The influence factors for technical condition of wheel/rail system are: highest running speed, transportation organization, locomotives and cars, track structure, etc.

It is shown that the traditional model is only fit to study low frequency vibrations of wheel/rail systems, and very serious errors will be produced when studying high frequency vibrations.

It is also a significant decision for Chinese railway to free itself from the currentdifficult situations in respect of Passenger traffic operation,However,the wheel/rail dynamicinteraction increases dramatically with the running speed,which brings about serious effecton the life of wheel/rail systems.

This paper has studied the matching relationship between rail and wheel by investigating the wear behavior of rail/wheel systems.

LIM wheel/rail traffic system, which has good capacity of gradeability and the adaptability to sharp curves, has already been applied in Japan, Canada, USA, Malaysia, China, and etc.