  For Fermi systems interacting with a Galilei invariant pair potential with a
cut-off for particles with highly different velocities the time evolution
corresponds to an automorphism. We prove that all states satisfying the
KMS-condition are locally normal with respect to the representation in
Fock-space. Removing the cut-off limit states remain locally normal provided
the interaction is repulsive or of positive type. The modular automorphism of
the von Neumann-algebra of the limit state coincides with the time evolution.
