With the aid of the Galerkin-Urabe method (1)the nonlinear hunting of bogies (8 to 12 DOFS) is analysed. This method allows to consider not only the first but also higher order Fourier terms of the periodic hunting motion. Nonlinear geometry, changing contact areas, jumping contact points, nonlinear creep forces and axle box clearances are taken into account.

Limit cycle diagramms (lateral amplitude versus speed) and time history graphs of the state variables and the contact forces will be presented as well.