  The Ultra-relativistic Quantum-Molecular-Dynamics model (UrQMD) is used to
study central Pb+Pb reactions at RHIC ($\sqrt{s}=200$ AGeV). The computed
collision spectrum reveals that the major part (approx. 80%) of the dynamics is
governed by interactions below $\sqrt{s}=100$ GeV. Rapidity spectra of
net-baryons (Protons, Hyperons) and produced particles (Pions, Kaons) are
predicted. The transverse expansion is studied.
