  We investigate transport properties of topologically disordered,
three-dimensional, one-particle, tight binding models, featuring site distance
dependent hopping terms. We start from entirely disordered systems into which
we gradually introduce some short range order by numerically performing a
pertinent structural relaxation using local site-pair interactions. Transport
properties of the resulting models within the delocalized regime are analyzed
numerically using linear response theory. We find that even though the
generated order is very short ranged, transport properties such as conductivity
or mean free path scale significantly with the degree of order. Mean free paths
may exceed site-pair correlation length. It is furthermore demonstrated that,
while the totally disordered model is not in accord with a Drude- or
Boltzmann-type description, moderate degrees of order suffice to render such a
picture valid.
